<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!--Converted with LaTeX2HTML 2002-2-1 (1.71) original version by: Nikos Drakos, CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>4.4.3.4 Cartesian exponential axes</TITLE> <META NAME="description" CONTENT="4.4.3.4 Cartesian exponential axes"> <META NAME="keywords" CONTENT="GMT_Docs"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META NAME="Generator" CONTENT="LaTeX2HTML v2002-2-1"> <META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"> <LINK REL="STYLESHEET" HREF="GMT_Docs.css"> <LINK REL="next" HREF="node47.html"> <LINK REL="previous" HREF="node45.html"> <LINK REL="up" HREF="node42.html"> <LINK REL="next" HREF="node47.html"> </HEAD> <BODY bgcolor="#ffffff"> <!--Navigation Panel--> <A NAME="tex2html3282" HREF="node47.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html3276" HREF="node42.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html3270" HREF="node45.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html3278" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <A NAME="tex2html3280" HREF="node258.html"> <IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="index.png"></A> <BR> <B> Next:</B> <A NAME="tex2html3283" HREF="node47.html">4.4.3.5 Cartesian time axes</A> <B> Up:</B> <A NAME="tex2html3277" HREF="node42.html">4.4.3 Map frame and</A> <B> Previous:</B> <A NAME="tex2html3271" HREF="node45.html">4.4.3.3 Cartesian log axes</A> <B> <A NAME="tex2html3279" HREF="node1.html">Contents</A></B> <B> <A NAME="tex2html3281" HREF="node258.html">Index</A></B> <BR> <BR> <!--End of Navigation Panel--> <H3><A NAME="SECTION001243400000000000000"> 4.4.3.4 Cartesian exponential axes</A> </H3> Normally, <I>stride</I> will be used to create equidistant (in the user's unit) annotations or ticks, but because of the exponential nature of the axis, such annotations may converge on each other at one end of the axis. To avoid this problem, you can append <B>p </B>to <I>stride</I>, and the annotation interval is expected to be in transformed units, yet the annotation itself will be plotted as un-transformed units. E.g., if <I>stride</I> = 1 and power = 0.5 (i.e., sqrt), then equidistant annotations labeled 1, 4, 9, ... will appear. <P> <DIV ALIGN="CENTER"><A NAME="fig:GMT_-B_pow"></A><A NAME="19528"></A> <TABLE> <CAPTION ALIGN="BOTTOM"><STRONG>Figure:</STRONG> Exponential or power projection axis. (top) Using an exponent of 0.5 yields a <IMG WIDTH="25" HEIGHT="33" ALIGN="MIDDLE" BORDER="0" SRC="img3.png" ALT="$\sqrt {x}$"> axis. Here, intervals refer to actual data values, in <B>-R</B>0/100/0/1 <B>-JX</B>3<B>p</B>0.5/0.4 <B>-Ba</B>20<B>f</B>10<B>g</B>5. (bottom) Here, intervals refer to projected values, although the annotation uses the corresponding unprojected values, as in <B>-Ba</B>3<B>f</B>2<B>g</B>1<B>p</B>.</CAPTION> <TR><TD> <DIV ALIGN="CENTER"><IMG WIDTH="362" HEIGHT="193" ALIGN="BOTTOM" BORDER="0" SRC="img55.png" ALT="\includegraphics{scripts/GMT_-B_pow}"></DIV></TD></TR> </TABLE> </DIV> <P> <A NAME="18234"></A> <A NAME="18235"></A> <HR> <!--Navigation Panel--> <A NAME="tex2html3282" HREF="node47.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html3276" HREF="node42.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html3270" HREF="node45.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html3278" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <A NAME="tex2html3280" HREF="node258.html"> <IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="index.png"></A> <BR> <B> Next:</B> <A NAME="tex2html3283" HREF="node47.html">4.4.3.5 Cartesian time axes</A> <B> Up:</B> <A NAME="tex2html3277" HREF="node42.html">4.4.3 Map frame and</A> <B> Previous:</B> <A NAME="tex2html3271" HREF="node45.html">4.4.3.3 Cartesian log axes</A> <B> <A NAME="tex2html3279" HREF="node1.html">Contents</A></B> <B> <A NAME="tex2html3281" HREF="node258.html">Index</A></B> <!--End of Navigation Panel--> <ADDRESS> Paul Wessel 2011-02-27 </ADDRESS> </BODY> </HTML>