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<b class="current">Colour Maps, Contour Maps and Surface Plots</b>
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<div><h2 id="a0000000050">1.2.7 Colour Maps, Contour Maps and Surface Plots</h2>
<p>The following plot styles differ from those above in that, regardless of whether a three-dimensional plot is being produced, they read in datapoints with <img src="images/img-0019.png" alt="$x$" style="vertical-align:0px;
width:10px;
height:8px" class="math gen" />, <img src="images/img-0020.png" alt="$y$" style="vertical-align:-4px;
width:9px;
height:12px" class="math gen" /> and <img src="images/img-0101.png" alt="$z$" style="vertical-align:0px;
width:9px;
height:8px" class="math gen" /> coordinates in three columns. The first two are useful for producing two-dimensional representations of <img src="images/img-0340.png" alt="$(x,y,z)$" style="vertical-align:-4px;
width:57px;
height:18px" class="math gen" /> surfaces using colours or contours to show the magnitude of <img src="images/img-0101.png" alt="$z$" style="vertical-align:0px;
width:9px;
height:8px" class="math gen" />, while the third is useful for producing three-dimensional graphs of such surfaces: </p><ul class="itemize">
<li><p>colourmap </p></li><li><p>contourmap </p></li><li><p>surface </p></li>
</ul><p> They are discussed in detail in Sections <a href="sec-colourmaps.html">1.12</a>, <a href="sec-contourmaps.html">1.13</a> and <a href="ex-surface-sinc.html">1.14.1</a> respectively. </p></div>
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