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#!N
#!N
#!Rcategor Categorize #!N #!N Category #!N #!N #!Lcattrn,dxall763 h Transformation #!EL #!N #!N Function
#!N #!N Categorizes components of a field #!N #!N Syntax #!CForestGreen
#!N #!N #!F-adobe-courier-bold-r-normal--18* #!N #!F-adobe-times-bold-r-normal--18* output #!EF = Categorize( #!F-adobe-times-bold-r-normal--18* input,
name #!EF ); #!EF #!N #!N #!EC #!N #!N Inputs #!T,1,91,276,461,646
#!F-adobe-times-medium-r-normal--14* #!F-adobe-times-bold-r-normal--18* #!N TAB Name TAB Type TAB Default TAB Description
#!EF #!N TAB input TAB field TAB none TAB field to
categorize #!N TAB name TAB string or string list TAB "data"
TAB component to categorize #!N TAB - TAB - TAB -
TAB #!EF #!N #!N Outputs #!T,1,161,321,646 #!F-adobe-times-medium-r-normal--14* #!F-adobe-times-bold-r-normal--18* #!N TAB Name
TAB Type TAB Description #!EF #!N TAB output TAB field TAB
with additional lookup components #!N TAB - TAB - TAB #!EF
#!N #!N Functional Details #!N #!N #!I0 #!N #!N #!I0 #!N
#!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* input #!EF #!EF #!I50 #!N is the field containing
the components to categorize #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* name #!EF
#!EF #!I50 #!N is the name or names of the components
to categorize #!I0 #!N #!N #!N #!N The Categorize module converts
a component of any type to an integer array that references
a newly created "lookup" component, which is a sorted list of
the unique values in the original component. This serves to #!N
#!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N 1. reduce the size
of a component that contains duplicate values, #!N #!I30 #!N 2.
allow conversion of string or vector data to "categorical" data, #!N
#!I30 #!N 3. detect repeated values in a component, and #!N
#!I30 #!N 4. create a sorted list of the unique values
in a component for inspection. #!N #!I0 #!N #!EF #!N #!N
#!N Each component that is categorized will yield its own lookup
component named "compname lookup," where compname is the name of the
categorized component. #!N #!N For example, if the component name is
"state" and its values are �"MO," "CA," "MO," "NH," "AK," "NH"�
then Categorize(field, "state") would convert component state to: �2, 1, 2,
3, 0, 3� and produce a new component, "state lookup" containing
the values �"AK," "CA," "MO," "NH"�. #!N #!N #!I0 #!N Notes:
#!N #!I30 #!N 1. Categorize works on scalar, string, or vectors
of any type, with the lookup component sorted in order of
x, y, z, ... If the lookup component has fewer items
than the original component, then there are duplicate values in the
original component. If the lookup component has 256 or fewer items,
the categorized component will be of type unsigned byte; otherwise it
will be of type int. #!N #!I30 #!N 2. Categorical data
can be converted back to its original values using either the
Lookup module or Map. If the lookup component is of type
string, it can be input as the #!F-adobe-times-bold-r-normal--18* labels #!EF parameter
of Plot, ColorBar, or AutoAxes to label the values 0, 1,
.. n-1 with the corresponding strings. This helps automate the labelling
of categorical plots. Data imported by ImportSpreadsheet can be categorized on
import directly by specifying the components to categorize. Statistics on the
categorized component, and another associated component, can be found with CategoryStatistics.
Include can be used to remove data by category. #!I0 #!N
#!N #!N #!N Components #!N #!N Modifies the components specified by
#!F-adobe-times-bold-r-normal--18* name #!EF , replacing it by a list of indices.
Adds a new component with the name " #!F-adobe-times-bold-r-normal--18* name #!EF
lookup" which is a lookup table for component #!F-adobe-times-bold-r-normal--18* name #!EF
. #!N #!N Example Visual Programs #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!N
Duplicates.net #!N Categorical.net (Categorize is called on import by ImportSpreadsheet) #!EF
#!N #!N #!EC #!N #!N See Also #!N #!N #!Lcategst,dxall783 h CategoryStatistics #!EL ,
#!Limpspsh,dxall872 h ImportSpreadsheet #!EL #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Lcategst,dxall783 h CategoryStatistics #!EL
#!N #!F-adobe-times-medium-i-normal--18* #!N
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