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<H2><A NAME="SECTION0012151000000000000000">
4.15.1 Categorical CPT files</A>
</H2>

<P>
Note: This is an experimental component and is only available if you compile <A NAME="tex2html1151"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> with <B>-DGMT_CPT2</B>.
Categorical data are information on which normal numerical operations are not
defined. As an example, consider various land classifications (desert, forest, glacier, etc.)
and it is clear that even if we assigned a numerical value to these categories (e.g.,
desert = 1, forest = 2, etc) it would be meaningless to compute average values (what would
1.5 mean?).  For such data a special format of the CPT files are provided.  Here,
each category is assigned a unique key, a color or pattern, and an optional
label (usually the category name).  Keys must be monotonically increasing but do not
need to be consecutive.  The format is

<P>
<DIV ALIGN="CENTER">
<TABLE CELLPADDING=3>
<TR><TD ALIGN="LEFT">key<IMG
 WIDTH="11" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img27.png"
 ALT="$_1$"></TD>
<TD ALIGN="LEFT"><I>fill</I></TD>
<TD ALIGN="LEFT"><I>label</I></TD>
</TR>
<TR><TD ALIGN="LEFT">...</TD>
<TD ALIGN="LEFT">&nbsp;</TD>
<TD ALIGN="LEFT">&nbsp;</TD>
</TR>
<TR><TD ALIGN="LEFT">key<IMG
 WIDTH="11" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img65.png"
 ALT="$_n$"></TD>
<TD ALIGN="LEFT"><I>fill</I></TD>
<TD ALIGN="LEFT"><I>label</I></TD>
</TR>
</TABLE>
</DIV>

<P>
The <I>fill</I> information follows the format given in Section <A HREF="node66.html#sec:fill">4.14</A>.
While not always applicable to categorical data, the background color (for
<I>key</I>-values <IMG
 WIDTH="16" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img13.png"
 ALT="$&lt;$"> <I>key<IMG
 WIDTH="11" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img27.png"
 ALT="$_1$"></I>), foreground color
(for <I>key</I>-values <IMG
 WIDTH="16" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img11.png"
 ALT="$&gt;$"> <I>key<IMG
 WIDTH="11" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img66.png"
 ALT="$_{n}$"></I>), and not-a-number (NaN) color (for
<I>key</I>-values = NaN) are all defined in the <U>.gmtdefaults4</U>
file, but can be overridden by the statements

<P>
<DIV ALIGN="CENTER">
<TABLE CELLPADDING=3>
<TR><TD ALIGN="LEFT">B</TD>
<TD ALIGN="LEFT">R<IMG
 WIDTH="27" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img67.png"
 ALT="$_{back}$"></TD>
<TD ALIGN="LEFT">G<IMG
 WIDTH="27" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img67.png"
 ALT="$_{back}$"></TD>
<TD ALIGN="LEFT">B<IMG
 WIDTH="27" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img67.png"
 ALT="$_{back}$"></TD>
</TR>
<TR><TD ALIGN="LEFT">F</TD>
<TD ALIGN="LEFT">R<IMG
 WIDTH="27" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img68.png"
 ALT="$_{fore}$"></TD>
<TD ALIGN="LEFT">G<IMG
 WIDTH="27" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img68.png"
 ALT="$_{fore}$"></TD>
<TD ALIGN="LEFT">B<IMG
 WIDTH="27" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img68.png"
 ALT="$_{fore}$"></TD>
</TR>
<TR><TD ALIGN="LEFT">N</TD>
<TD ALIGN="LEFT">R<IMG
 WIDTH="23" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img69.png"
 ALT="$_{nan}$"></TD>
<TD ALIGN="LEFT">G<IMG
 WIDTH="23" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img69.png"
 ALT="$_{nan}$"></TD>
<TD ALIGN="LEFT">B<IMG
 WIDTH="23" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img69.png"
 ALT="$_{nan}$"></TD>
</TR>
</TABLE>
</DIV>

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2010-01-14
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