<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML ><HEAD ><TITLE >Graphics </TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="From VMS to Linux HOWTO" HREF="index.html"><LINK REL="PREVIOUS" TITLE="Programming " HREF="programming.html"><LINK REL="NEXT" TITLE="Mail and Internet Tools " HREF="mail-and-internet-tools.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >From VMS to Linux HOWTO</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="programming.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="mail-and-internet-tools.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="GRAPHICS" ></A >6. Graphics</H1 ><P >Among the scores of graphic packages available, <TT CLASS="LITERAL" >gnuplot</TT > stands out for its power and ease of use. Go to X and type <TT CLASS="LITERAL" >gnuplot</TT >, and have two sample data files ready: <TT CLASS="LITERAL" >2D-data.dat</TT > (two data per line), and <TT CLASS="LITERAL" >3D-data.dat</TT > (three data per line).</P ><P >Examples of 2-D graphs:</P ><P > <TABLE BORDER="1" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="SCREEN" >gnuplot> set title "my first graph" gnuplot> plot '2D-data.dat' gnuplot> plot '2D-data.dat' with linespoints gnuplot> plot '2D-data.dat', sin(x) gnuplot> plot [-5:10] '2D-data.dat'</PRE ></FONT ></TD ></TR ></TABLE > </P ><P >Example of 3-D graphs (each `row' of X values is followed by a blank line):</P ><P > <TABLE BORDER="1" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="SCREEN" >gnuplot> set parametric ; set hidden3d ; set contour gnuplot> splot '3D-data.dat' using 1:2:3 with linespoints</PRE ></FONT ></TD ></TR ></TABLE > </P ><P >A single-column datafile (e.g., a time series) can also be plotted as a 2-D graph:</P ><P > <TABLE BORDER="1" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="SCREEN" >gnuplot> plot [-5:15] '2D-data-1col.dat' with linespoints</PRE ></FONT ></TD ></TR ></TABLE > </P ><P >or as a 3-D graph (blank lines in the datafile, as above):</P ><P > <TABLE BORDER="1" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="SCREEN" >gnuplot> set noparametric ; set hidden3d gnuplot> splot '3D-data-1col.dat' using 1 with linespoints</PRE ></FONT ></TD ></TR ></TABLE > </P ><P >To print a graph: if the command to print on your Postscript printer is <TT CLASS="LITERAL" >lpr -Pps file.ps</TT >, issue:</P ><P > <TABLE BORDER="1" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="SCREEN" >gnuplot> set term post gnuplot> set out '| lpr -Pps' gnuplot> replot</PRE ></FONT ></TD ></TR ></TABLE > </P ><P >then type <TT CLASS="LITERAL" >set term x11</TT > to restore. Don't get confused---the last print will come out only when you quit <TT CLASS="LITERAL" >gnuplot</TT >.</P ><P >For more info, type <TT CLASS="LITERAL" >help</TT > or see the examples in directory <TT CLASS="LITERAL" >/usr/lib/gnuplot/demos/</TT >, if you have it.</P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="programming.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="mail-and-internet-tools.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Programming</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" > </TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Mail and Internet Tools</TD ></TR ></TABLE ></DIV ></BODY ></HTML >