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<H2><A NAME="SECTION001311000000000000000"></A>
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5.1.1 Cartesian Linear Projection (<B>-Jx</B> <B>-JX</B>)
</H2>
<A NAME="5815"></A>
<P>
Selection of this transformation will result in a linear scaling
of the input coordinates. The projection is defined by stating
<BR>
<P>
<IMG
WIDTH="12" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
SRC="img54.gif"
ALT="$\bullet$"> scale in inches/unit (<B>-Jx</B>) or axis
length in inches (<B>-JX</B>)
<BR>
<P>
If the <I>y</I>-scale or <I>y</I>-axis length is different from that of
the <I>x</I>-axis (which is most often the case), separate the two
scales (or lengths) by a slash, e.g., <B>-Jx</B>0.1i/0.5i or <B>-JX</B>8i/5i.
Thus, our <IMG
WIDTH="51" HEIGHT="33" ALIGN="MIDDLE" BORDER="0"
SRC="img55.gif"
ALT="$y = \sqrt{x}$"> data sets will plot as shown
in Figure <A HREF="node36.html#fig:GMT_linear">5.1</A>.
<P>
<P></P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_linear"></A><A NAME="5826"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5.1:</STRONG>
Linear transformation of coordinates</CAPTION>
<TR><TD><IMG
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SRC="img56.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_linear.eps}\end{figure}"></TD></TR>
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<P>
The complete commands given to produce this plot were
<P>
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<BR CLEAR="ALL">
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<PRE>
#!/bin/sh
# $Id: GMT_linear.sh,v 1.1 2001/03/21 04:10:21 pwessel Exp $
#
psxy -R0/100/0/10 -JX3i/1.5i -Ba20f10g10/a2f1g2WSne -W1t3_3:0p -P -K sqrt.d > GMT_linear.ps
psxy -R -JX -St0.075i -G200 -W -O sqrt.d10 >> GMT_linear.ps
</PRE>
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<BR>
<P>
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<P>
Normally, the user's <I>x</I>-values will increase to the right
and the <I>y</I>-values will increase upwards. It should be noted
that in many situations it is desirable to have the direction of
positive coordinates be reversed. For example, when plotting
depth on the <I>y</I>-axis it makes more sense to have the positive
direction downwards. All that is required to reverse the sense of
positive direction is to supply a negative scale (or axis length).
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<ADDRESS>
Paul Wessel
2001-04-18
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