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<H3><A NAME="SECTION001243300000000000000">
4.4.3.3 Cartesian log<IMG
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ALT="$_{10}$"> axes</A>
</H3>
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<A NAME="18072"></A>
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<P>
Due to the logarithmic nature of annotation spacings, the <I>stride</I> parameter takes on specific
meanings. The following concerns are specific to log axes:
<P>
<OL>
<LI><I>stride</I> must be 1, 2, 3, or a negative integer <IMG
WIDTH="24" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img49.png"
ALT="$-n$">. Annotations/ticks will
then occur at 1, 1-2-5, or 1,2,3,4,...,9, respectively, for each magnitude range.
For <IMG
WIDTH="24" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img49.png"
ALT="$-n$"> the annotations will take place every <I>n</I>'th magnitude.
<P>
</LI>
<LI>Append <B>l</B> to <I>stride</I>. Then, log<IMG
WIDTH="17" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img2.png"
ALT="$_{10}$"> of the annotation
is plotted at every integer log<IMG
WIDTH="17" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img2.png"
ALT="$_{10}$"> value (e.g., <IMG
WIDTH="54" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img50.png"
ALT="$x = 100$"> will be annotated as ``2'')
[Default annotates <IMG
WIDTH="11" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img4.png"
ALT="$x$"> as is].
<P>
</LI>
<LI>Append <B>p</B> to <I>stride</I>. Then, annotations appear as 10
raised to log<IMG
WIDTH="17" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img2.png"
ALT="$_{10}$"> of the value (e.g., <IMG
WIDTH="36" HEIGHT="35" ALIGN="MIDDLE" BORDER="0"
SRC="img51.png"
ALT="$10^{-5}$">).
<P>
</LI>
</OL>
<P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_-B_log"></A><A NAME="18413"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 4.9:</STRONG>
Logarithmic projection axis using separate values for annotation,
frame, and grid intervals. (top) Here, we have chosen to annotate the actual
values. Interval = 1 means every whole power of 10, 2 means 1, 2, 5 times
powers of 10, and 3 means every 0.1 times powers of 10. We used
<B>-R</B>1/1000/0/1 <B>-JX</B>3l/0.4 <B>-Ba</B>1<B>f</B>2<B>g</B>3.
(middle) Here, we have chosen to
annotate log<IMG
WIDTH="17" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img2.png"
ALT="$_{10}$"> of the actual values, with <B>-Ba</B>1<B>f</B>2<B>g</B>3<B>l</B>.
(bottom) We annotate every power of 10 using log<IMG
WIDTH="17" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img2.png"
ALT="$_{10}$"> of the actual values
as exponents, with <B>-Ba</B>1<B>f</B>2<B>g</B>3<B>p</B>.</CAPTION>
<TR><TD>
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<ADDRESS>
Paul Wessel
2010-01-14
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