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