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<a href="slepc4py-module.html">Package slepc4py</a> ::
<a href="slepc4py.SLEPc-module.html">Module SLEPc</a> ::
Class DS
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<h1 class="epydoc">Class DS</h1><p class="nomargin-top"></p>
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DS
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<a href="slepc4py.SLEPc.DS.MatType-class.html" class="summary-name">MatType</a><br />
To refer to one of the matrices stored internally in DS
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<span class="summary-type"> </span>
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<a href="slepc4py.SLEPc.DS.StateType-class.html" class="summary-name">StateType</a><br />
DS state types
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<a href="slepc4py.SLEPc.DS.Type-class.html" class="summary-name">Type</a><br />
DS type
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<span class="summary-type">a new object with type S, a subtype of T</span>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#__new__" class="summary-sig-name">__new__</a>(<span class="summary-sig-arg">S</span>,
<span class="summary-sig-arg">...</span>)</span></td>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#allocate" class="summary-sig-name">allocate</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">ld</span>)</span><br />
Allocates memory for internal storage or matrices in DS.</td>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#create" class="summary-sig-name">create</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">comm</span>=<span class="summary-sig-default">None</span>)</span><br />
Creates the DS object.</td>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#destroy" class="summary-sig-name">destroy</a>(<span class="summary-sig-arg">self</span>)</span><br />
Destroys the DS object.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#getCompact" class="summary-sig-name">getCompact</a>(<span class="summary-sig-arg">self</span>)</span><br />
Gets the compact storage flag.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#getDimensions" class="summary-sig-name">getDimensions</a>(<span class="summary-sig-arg">self</span>)</span><br />
Returns the current dimensions.</td>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#getExtraRow" class="summary-sig-name">getExtraRow</a>(<span class="summary-sig-arg">self</span>)</span><br />
Gets the extra row flag.</td>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#getLeadingDimension" class="summary-sig-name">getLeadingDimension</a>(<span class="summary-sig-arg">self</span>)</span><br />
Returns the leading dimension of the allocated matrices.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#getMethod" class="summary-sig-name">getMethod</a>(<span class="summary-sig-arg">self</span>)</span><br />
Gets the method currently used in the DS.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#getOptionsPrefix" class="summary-sig-name">getOptionsPrefix</a>(<span class="summary-sig-arg">self</span>)</span><br />
Gets the prefix used for searching for all DS options in the
database.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#getRefined" class="summary-sig-name">getRefined</a>(<span class="summary-sig-arg">self</span>)</span><br />
Gets the refined vectors flag.</td>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#getState" class="summary-sig-name">getState</a>(<span class="summary-sig-arg">self</span>)</span><br />
Returns the current state.</td>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#getType" class="summary-sig-name">getType</a>(<span class="summary-sig-arg">self</span>)</span><br />
Gets the DS type of this object.</td>
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<td><span class="summary-sig"><a name="reset"></a><span class="summary-sig-name">reset</span>(<span class="summary-sig-arg">self</span>)</span><br />
Resets the DS object.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#setCompact" class="summary-sig-name">setCompact</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">comp</span>)</span><br />
Switch to compact storage of matrices.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#setDimensions" class="summary-sig-name">setDimensions</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">n</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">m</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">l</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">k</span>=<span class="summary-sig-default">None</span>)</span><br />
Resize the matrices in the DS object.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#setExtraRow" class="summary-sig-name">setExtraRow</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">ext</span>)</span><br />
Sets a flag to indicate that the matrix has one extra row.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#setFromOptions" class="summary-sig-name">setFromOptions</a>(<span class="summary-sig-arg">self</span>)</span><br />
Sets DS options from the options database.</td>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#setMethod" class="summary-sig-name">setMethod</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">meth</span>)</span><br />
Selects the method to be used to solve the problem.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#setOptionsPrefix" class="summary-sig-name">setOptionsPrefix</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">prefix</span>)</span><br />
Sets the prefix used for searching for all DS options in the
database.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#setRefined" class="summary-sig-name">setRefined</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">ref</span>)</span><br />
Sets a flag to indicate that refined vectors must be computed.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#setState" class="summary-sig-name">setState</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">state</span>)</span><br />
Change the state of the DS object.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#setType" class="summary-sig-name">setType</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">ds_type</span>)</span><br />
Selects the type for the DS object.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#truncate" class="summary-sig-name">truncate</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">n</span>)</span><br />
Truncates the system represented in the DS object.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="updateExtraRow"></a><span class="summary-sig-name">updateExtraRow</span>(<span class="summary-sig-arg">self</span>)</span><br />
Performs all necessary operations so that the extra
row gets up-to-date after a call to <code class="link">solve()</code>.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a href="slepc4py.SLEPc.DS-class.html#view" class="summary-sig-name">view</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">Viewer viewer</span>=<span class="summary-sig-default">None</span>)</span><br />
Prints the DS data structure.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td colspan="2" class="summary">
<p class="indent-wrapped-lines"><b>Inherited from <code>petsc4py.PETSc.Object</code></b>:
<code>__copy__</code>,
<code>__deepcopy__</code>,
<code>__eq__</code>,
<code>__ge__</code>,
<code>__gt__</code>,
<code>__le__</code>,
<code>__lt__</code>,
<code>__ne__</code>,
<code>__nonzero__</code>,
<code>compose</code>,
<code>decRef</code>,
<code>getAttr</code>,
<code>getClassId</code>,
<code>getClassName</code>,
<code>getComm</code>,
<code>getDict</code>,
<code>getName</code>,
<code>getRefCount</code>,
<code>getTabLevel</code>,
<code>incRef</code>,
<code>incrementTabLevel</code>,
<code>query</code>,
<code>setAttr</code>,
<code>setName</code>,
<code>setTabLevel</code>,
<code>stateIncrease</code>
</p>
<p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
<code>__delattr__</code>,
<code>__format__</code>,
<code>__getattribute__</code>,
<code>__hash__</code>,
<code>__init__</code>,
<code>__reduce__</code>,
<code>__reduce_ex__</code>,
<code>__repr__</code>,
<code>__setattr__</code>,
<code>__sizeof__</code>,
<code>__str__</code>,
<code>__subclasshook__</code>
</p>
</td>
</tr>
</table>
<!-- ==================== PROPERTIES ==================== -->
<a name="section-Properties"></a>
<table class="summary" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
<td colspan="2" class="table-header">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr valign="top">
<td align="left"><span class="table-header">Properties</span></td>
<td align="right" valign="top"
><span class="options">[<a href="#section-Properties"
class="privatelink" onclick="toggle_private();"
>hide private</a>]</span></td>
</tr>
</table>
</td>
</tr>
<tr>
<td colspan="2" class="summary">
<p class="indent-wrapped-lines"><b>Inherited from <code>petsc4py.PETSc.Object</code></b>:
<code>classid</code>,
<code>comm</code>,
<code>fortran</code>,
<code>handle</code>,
<code>klass</code>,
<code>name</code>,
<code>prefix</code>,
<code>refcount</code>,
<code>type</code>
</p>
<p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
<code>__class__</code>
</p>
</td>
</tr>
</table>
<!-- ==================== METHOD DETAILS ==================== -->
<a name="section-MethodDetails"></a>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
<td colspan="2" class="table-header">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr valign="top">
<td align="left"><span class="table-header">Method Details</span></td>
<td align="right" valign="top"
><span class="options">[<a href="#section-MethodDetails"
class="privatelink" onclick="toggle_private();"
>hide private</a>]</span></td>
</tr>
</table>
</td>
</tr>
</table>
<a name="__new__"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">__new__</span>(<span class="sig-arg">S</span>,
<span class="sig-arg">...</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<dl class="fields">
<dt>Returns: a new object with type S, a subtype of T</dt>
<dt>Overrides:
object.__new__
</dt>
</dl>
</td></tr></table>
</div>
<a name="allocate"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">allocate</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">ld</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Allocates memory for internal storage or matrices in DS.</p>
<div class="rst-section" id="rst-parameters">
<h1 class="heading">Parameters</h1>
<dl class="rst-docutils">
<dt>ld: integer</dt>
<dd>Leading dimension (maximum allowed dimension for the
matrices, including the extra row if present).</dd>
</dl>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="create"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">create</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">comm</span>=<span class="sig-default">None</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Creates the DS object.</p>
<div class="rst-section" id="rst-parameters">
<h1 class="heading">Parameters</h1>
<dl class="rst-docutils">
<dt>comm: Comm, optional</dt>
<dd>MPI communicator; if not provided, it defaults to all
processes.</dd>
</dl>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="destroy"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">destroy</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
Destroys the DS object.
<dl class="fields">
<dt>Overrides:
petsc4py.PETSc.Object.destroy
</dt>
</dl>
</td></tr></table>
</div>
<a name="getCompact"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">getCompact</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Gets the compact storage flag.</p>
<div class="rst-section" id="rst-returns">
<h1 class="heading">Returns</h1>
<dl class="rst-docutils">
<dt>comp: boolean</dt>
<dd>The flag.</dd>
</dl>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="getDimensions"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">getDimensions</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Returns the current dimensions.</p>
<div class="rst-section" id="rst-returns">
<h1 class="heading">Returns</h1>
<dl class="rst-docutils">
<dt>n: int</dt>
<dd>The new size.</dd>
<dt>m: int</dt>
<dd>The new column size (only for SVD).</dd>
<dt>l: int</dt>
<dd>Number of locked (inactive) leading columns.</dd>
<dt>k: int</dt>
<dd>Intermediate dimension (e.g., position of arrow).</dd>
<dt>t: int</dt>
<dd>Truncated length.</dd>
</dl>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="getExtraRow"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">getExtraRow</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Gets the extra row flag.</p>
<div class="rst-section" id="rst-returns">
<h1 class="heading">Returns</h1>
<dl class="rst-docutils">
<dt>comp: boolean</dt>
<dd>The flag.</dd>
</dl>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="getLeadingDimension"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">getLeadingDimension</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Returns the leading dimension of the allocated matrices.</p>
<div class="rst-section" id="rst-returns">
<h1 class="heading">Returns</h1>
<dl class="rst-docutils">
<dt>ld: integer</dt>
<dd>Leading dimension (maximum allowed dimension for the matrices).</dd>
</dl>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="getMethod"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">getMethod</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Gets the method currently used in the DS.</p>
<div class="rst-section" id="rst-returns">
<h1 class="heading">Returns</h1>
<dl class="rst-docutils">
<dt>meth: int</dt>
<dd>Identifier of the method.</dd>
</dl>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="getOptionsPrefix"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">getOptionsPrefix</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Gets the prefix used for searching for all DS options in the
database.</p>
<div class="rst-section" id="rst-returns">
<h1 class="heading">Returns</h1>
<dl class="rst-docutils">
<dt>prefix: string</dt>
<dd>The prefix string set for this DS object.</dd>
</dl>
</div>
<dl class="fields">
<dt>Overrides:
petsc4py.PETSc.Object.getOptionsPrefix
</dt>
</dl>
</td></tr></table>
</div>
<a name="getRefined"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">getRefined</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Gets the refined vectors flag.</p>
<div class="rst-section" id="rst-returns">
<h1 class="heading">Returns</h1>
<dl class="rst-docutils">
<dt>comp: boolean</dt>
<dd>The flag.</dd>
</dl>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="getState"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">getState</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Returns the current state.</p>
<div class="rst-section" id="rst-returns">
<h1 class="heading">Returns</h1>
<dl class="rst-docutils">
<dt>state: <a href="slepc4py.SLEPc.DS.StateType-class.html" class="link">DS.StateType</a> enumerate</dt>
<dd>The current state.</dd>
</dl>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="getType"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">getType</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Gets the DS type of this object.</p>
<div class="rst-section" id="rst-returns">
<h1 class="heading">Returns</h1>
<dl class="rst-docutils">
<dt>type: <a href="slepc4py.SLEPc.DS.Type-class.html" class="link">DS.Type</a> enumerate</dt>
<dd>The direct solver type currently being used.</dd>
</dl>
</div>
<dl class="fields">
<dt>Overrides:
petsc4py.PETSc.Object.getType
</dt>
</dl>
</td></tr></table>
</div>
<a name="setCompact"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">setCompact</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">comp</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Switch to compact storage of matrices.</p>
<div class="rst-section" id="rst-parameters">
<h1 class="heading">Parameters</h1>
<dl class="rst-docutils">
<dt>comp: boolean</dt>
<dd>A boolean flag.</dd>
</dl>
</div>
<div class="rst-section" id="rst-notes">
<h1 class="heading">Notes</h1>
<p>Compact storage is used in some <a href="slepc4py.SLEPc.DS-class.html" class="link">DS</a> types such as
<a href="slepc4py.SLEPc.DS.Type-class.html#HEP" class="link">DS.Type.HEP</a> when the matrix is tridiagonal. This flag
can be used to indicate whether the user provides the
matrix entries via the compact form (the tridiagonal
<a href="slepc4py.SLEPc.DS.MatType-class.html#T" class="link">DS.MatType.T</a>) or the non-compact one (<a href="slepc4py.SLEPc.DS.MatType-class.html#A" class="link">DS.MatType.A</a>).</p>
<p>The default is <tt class="rst-docutils literal">False</tt>.</p>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="setDimensions"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">setDimensions</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">n</span>=<span class="sig-default">None</span>,
<span class="sig-arg">m</span>=<span class="sig-default">None</span>,
<span class="sig-arg">l</span>=<span class="sig-default">None</span>,
<span class="sig-arg">k</span>=<span class="sig-default">None</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Resize the matrices in the DS object.</p>
<div class="rst-section" id="rst-parameters">
<h1 class="heading">Parameters</h1>
<dl class="rst-docutils">
<dt>n: int, optional</dt>
<dd>The new size.</dd>
<dt>m: int, optional</dt>
<dd>The new column size (only for SVD).</dd>
<dt>l: int, optional</dt>
<dd>Number of locked (inactive) leading columns.</dd>
<dt>k: int, optional</dt>
<dd>Intermediate dimension (e.g., position of arrow).</dd>
</dl>
</div>
<div class="rst-section" id="rst-notes">
<h1 class="heading">Notes</h1>
<p>The internal arrays are not reallocated.</p>
<p>The value <code class="link">m</code> is not used except in the case of DS.SVD.</p>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="setExtraRow"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">setExtraRow</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">ext</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Sets a flag to indicate that the matrix has one extra row.</p>
<div class="rst-section" id="rst-parameters">
<h1 class="heading">Parameters</h1>
<dl class="rst-docutils">
<dt>ext: boolean</dt>
<dd>A boolean flag.</dd>
</dl>
</div>
<div class="rst-section" id="rst-notes">
<h1 class="heading">Notes</h1>
<p>In Krylov methods it is useful that the matrix representing
the direct solver has one extra row, i.e., has dimension (n+1)
x n. If this flag is activated, all transformations applied to
the right of the matrix also affect this additional row. In
that case, (n+1) must be less or equal than the leading
dimension.</p>
<p>The default is <tt class="rst-docutils literal">False</tt>.</p>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="setFromOptions"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">setFromOptions</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Sets DS options from the options database.</p>
<div class="rst-section" id="rst-notes">
<h1 class="heading">Notes</h1>
<p>To see all options, run your program with the <tt class="rst-docutils literal"><span class="pre">-help</span></tt>
option.</p>
</div>
<dl class="fields">
<dt>Overrides:
petsc4py.PETSc.Object.setFromOptions
</dt>
</dl>
</td></tr></table>
</div>
<a name="setMethod"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">setMethod</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">meth</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Selects the method to be used to solve the problem.</p>
<div class="rst-section" id="rst-parameters">
<h1 class="heading">Parameters</h1>
<dl class="rst-docutils">
<dt>meth: int</dt>
<dd>An index indentifying the method.</dd>
</dl>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="setOptionsPrefix"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">setOptionsPrefix</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">prefix</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Sets the prefix used for searching for all DS options in the
database.</p>
<div class="rst-section" id="rst-parameters">
<h1 class="heading">Parameters</h1>
<dl class="rst-docutils">
<dt>prefix: string</dt>
<dd>The prefix string to prepend to all DS option
requests.</dd>
</dl>
</div>
<div class="rst-section" id="rst-notes">
<h1 class="heading">Notes</h1>
<p>A hyphen (<tt class="rst-docutils literal">-</tt>) must NOT be given at the beginning of the
prefix name. The first character of all runtime options is
AUTOMATICALLY the hyphen.</p>
</div>
<dl class="fields">
<dt>Overrides:
petsc4py.PETSc.Object.setOptionsPrefix
</dt>
</dl>
</td></tr></table>
</div>
<a name="setRefined"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">setRefined</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">ref</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Sets a flag to indicate that refined vectors must be computed.</p>
<div class="rst-section" id="rst-parameters">
<h1 class="heading">Parameters</h1>
<dl class="rst-docutils">
<dt>ref: boolean</dt>
<dd>A boolean flag.</dd>
</dl>
</div>
<div class="rst-section" id="rst-notes">
<h1 class="heading">Notes</h1>
<p>Normally the vectors returned in <a href="slepc4py.SLEPc.DS.MatType-class.html#X" class="link">DS.MatType.X</a> are eigenvectors
of the projected matrix. With this flag activated, <code class="link">vectors()</code>
will return the right singular vector of the smallest singular
value of matrix At-theta*I, where At is the extended (n+1)xn
matrix and theta is the Ritz value. This is used in the
refined Ritz approximation.</p>
<p>The default is <tt class="rst-docutils literal">False</tt>.</p>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="setState"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">setState</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">state</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Change the state of the DS object.</p>
<div class="rst-section" id="rst-parameters">
<h1 class="heading">Parameters</h1>
<dl class="rst-docutils">
<dt>state: <a href="slepc4py.SLEPc.DS.StateType-class.html" class="link">DS.StateType</a> enumerate</dt>
<dd>The new state.</dd>
</dl>
</div>
<div class="rst-section" id="rst-notes">
<h1 class="heading">Notes</h1>
<p>The state indicates that the dense system is in an initial
state (raw), in an intermediate state (such as tridiagonal,
Hessenberg or Hessenberg-triangular), in a condensed state
(such as diagonal, Schur or generalized Schur), or in a
truncated state.</p>
<p>This function is normally used to return to the raw state when
the condensed structure is destroyed.</p>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="setType"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">setType</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">ds_type</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Selects the type for the DS object.</p>
<div class="rst-section" id="rst-parameters">
<h1 class="heading">Parameters</h1>
<dl class="rst-docutils">
<dt>ds_type: <a href="slepc4py.SLEPc.DS.Type-class.html" class="link">DS.Type</a> enumerate</dt>
<dd>The direct solver type to be used.</dd>
</dl>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="truncate"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">truncate</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">n</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Truncates the system represented in the DS object.</p>
<div class="rst-section" id="rst-parameters">
<h1 class="heading">Parameters</h1>
<dl class="rst-docutils">
<dt>n: integer</dt>
<dd>The new size.</dd>
</dl>
</div>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="view"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">view</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">Viewer viewer</span>=<span class="sig-default">None</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Prints the DS data structure.</p>
<div class="rst-section" id="rst-parameters">
<h1 class="heading">Parameters</h1>
<dl class="rst-docutils">
<dt>viewer: Viewer, optional</dt>
<dd>Visualization context; if not provided, the standard
output is used.</dd>
</dl>
</div>
<dl class="fields">
<dt>Overrides:
petsc4py.PETSc.Object.view
</dt>
</dl>
</td></tr></table>
</div>
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