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<H2><A NAME="SECTION001312000000000000000"></A>
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5.1.2 Logarithmic projection
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<P></P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_log"></A><A NAME="5911"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5.2:</STRONG>
Logarithmic 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="img57.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_log.eps}\end{figure}"></TD></TR>
</TABLE>
</DIV><P></P>
<P>
The log<IMG
WIDTH="17" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img9.gif"
ALT="$_{10}$"> transformation is selected by appending an <B>l</B>
(lower case L) immediately following the scale (or axis length)
value. Hence, to produce a plot in which the <I>x</I>-axis is
logarithmic (the <I>y</I>-axis remains linear), try
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#!/bin/sh
# $Id: GMT_log.sh,v 1.1 2001/03/21 04:10:21 pwessel Exp $
#
psxy -R1/100/0/10 -Jx1.5il/0.15i -B2g3/a2f1g2WSne -W1t2_2:0p -P -K -H sqrt.d > GMT_log.ps
psxy -R -Jx -Ss0.075i -G0 -W -O -H sqrt.d10 >> GMT_log.ps
</PRE>
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Note that if <I>x</I>- and <I>y</I>-scaling are different and
a log<IMG
WIDTH="17" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img9.gif"
ALT="$_{10}$">-log<IMG
WIDTH="17" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img9.gif"
ALT="$_{10}$"> plot is desired, the <B>l</B> must be
appended twice: Once after the <I>x</I>-scale (before the /) and
once after the <I>y</I>-scale.
<A NAME="5971"></A>
<A NAME="5972"></A>
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<ADDRESS>
Paul Wessel
2001-04-18
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