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<H2><A NAME="SECTION001313000000000000000"></A>
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5.1.3 Power projection
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<DIV ALIGN="CENTER"><A NAME="fig:GMT_pow"></A><A NAME="5991"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5.3:</STRONG>
Exponential or power transformation of <IMG
WIDTH="11" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img1.gif"
ALT="$x$">-coordinates</CAPTION>
<TR><TD><IMG
WIDTH="392" HEIGHT="210" BORDER="0"
SRC="img58.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_pow.eps}\end{figure}"></TD></TR>
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This projection allows us to display <I>x<IMG
WIDTH="11" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img10.gif"
ALT="$^a$"></I> versus <I>y<IMG
WIDTH="11" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img11.gif"
ALT="$^b$"></I>.
While <I>a</I> and <I>b</I> can be any values, we will select <I>a</I>
= 0.5 and <I>b</I> = 1 which means we will plot <I>y</I> versus <IMG
WIDTH="25" HEIGHT="33" ALIGN="MIDDLE" BORDER="0"
SRC="img59.gif"
ALT="$\sqrt{x}$">.
We indicate this scaling by appending a <B>p</B> (lower case P) followed
by the desired exponent, in our case 0.5. Since <I>b</I> = 1 we do not
need to specify <B>p</B>1 since it is identical to the linear scaling.
Thus our command becomes
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#!/bin/sh
# $Id: GMT_pow.sh,v 1.1 2001/03/21 04:10:21 pwessel Exp $
#
psxy -R0/100/0/10 -Jx0.3ip0.5/0.15i -Ba1p/a2f1WSne -W1p -P -K sqrt.d > GMT_pow.ps
psxy -R -Jx -Sc0.075i -G255 -W -O sqrt.d10 >> GMT_pow.ps
</PRE>
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<ADDRESS>
Paul Wessel
2001-04-18
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