Contributions to GNUPLOT 

This document describes GNUPLOT contributions which greatly improve
the functionality of GNUPLOT.  Not everything has been tested so we
offer them as is.  For questions please contact the author of that
particular mod.

 

 Point Skips 

Data Filtering Instead of just having two params following the style param, 
there are now 4:

1: line_type
2: point_type
3: point_skip   - gives the number of data samples per plotted point
4: point_offs   - gives the sample number on which to plot the first point

Thus points are plotted only for the samples n satisfying 
        n = point_skip*i + point_offs 
for some non-negative integer i.
From: pixar!sun!prony.Colorado.EDU!clarkmp@ucbvax.berkeley.edu  (Michael Clark)


Point Skip with Awk With UNIX,

gnuplot> plot "< awk '{if(NR%5==0)print$0}' file.dat" 

From: James Darrell McCauley, mccauley@ecn.purdue.edu


New Xlib mods.
From: gregg hanna (gregor@kafka.saic.com)

Vectors and Arrows

Program to convert lines to vectors This program turns line segments
into line segments with a half-arrow at the head:
by uncommenting two lines below, 
the arrowhead will be a triangle.
     optional arguments: size angle
where size is a fraction of each vector's magnitude and angle is in degrees 
all data taken from standard input, and output to standard output.
typical invocation:
arrow 0.2 15 vector.heads
From: andrew@jarthur.claremont.edu (Andrew M. Ross)


Vect2gp, an awk script to make gnuplot command script to draw 
a vector field map.  
From:  hiro@ice3.ori.u-tokyo.ac.jp (Yasu-Hiro YAMAZAKI)


GNUPLOT to SIPP This is a "far from perfect" converter
that takes gnuplot table output and splits it in polygons. Then it
calls sipp to render it.  You get sipp from isy.liu.se:/pub/sipp or
ask archie.  
From:  chammer@POST.uni-bielefeld.de  (Carsten Hammer)

 
 Histograms and Pie Charts

Histogram C program The short C program below is a filter 
that calculates a histogram from a sequence of numbers and prints the
output in such a format that Gnuplot can plot the histogram by the
command sequence 

    !histogram < datain > tmp;
    plot "tmp" with impulses

From:  mustafa@seas.smu.edu (Mustafa Kocaturk)

HG is an automatic histogram generator.
it reads a column of data from an input file and emits a [log] histogram

ks does ks or chi^2 tests on a set of input arrays.

you need the "numerical recipes in C" library somewhere on your system to link this one.
I can not undertake to fix bugs or add features, but I might do it if asked.
From: Steve Cumming stevec@geog.ubc.ca

Piechart C program The short C program below 
formats data for display as a piechart.
From: mccauley@ecn.purdue.edu (James Darrell McCauley)


 Interprocess Communications 

Notes of Windows Hooks
From: Maurice Castro,maurice@bruce.cs.monash.edu.au

Named Pipes Example 
From:  dtaber@deathstar.risc.rockwell.com (Don Taber)


PipeLib What the library does is set up to 20 programs going
(like gnuplot), then allows you to send to them as if the program
were typing on the command line.  I've included a brief set of docs
after the source code, in latex format.  There is no facility to watch
the output of a program.  
From: ssclift@neumann.uwaterloo.ca (Simon Clift) 
 
Popen example from lsqrfit The following function sends a command to
gnuplot.  Gnuplot will execute the command just as if you typed it at
the gnuplot command line.  This example is adapted from my least
squares fitting program which is located at ftp.cdrom.com in
pub/os2/2_x/unix/lsqrft14.zip.  Complete source is included.  
From: michael@krypton.mit.edu (Michael Courtney) 


Multiple logical plots on a single page 

Gawk script for multiple encapsulated postscript on a page It's slightly
more flexible than mpage, because it changes the aspect ratio of the
plots; mpage according to the documentation only allows 1, 2, 4, or 8
plots on a page.  This script works for unix with encapsulated
postscript (eps) output.  It should work with gawk or nawk, although
I've only tested it with gawk.  (Gawk is GNU's version of awk and is
available from prep.ai.mit.edu.)  You just specify how many rows and
columns of plots you want and it does the rest.  For example,

        gnuplot_eps rows=3 cols=2 *.eps | lpr

will print all eps files in your current directory with 6 on a page.
Also, see the comments in the file.
From: holt@goethe.cns.caltech.edu (Gary Holt)


Sed script for multiple encapsulated postscript on a page You have MULTIPLE
postscript files each containing a single plot.
From: wgchoe@scoupe.postech.ac.kr (Choe Won Gyu)


Massive patch with add multiplotcapability to all devices and a lot more.  
The reason it is offered in this form is because the original
multiplot.pat did not patch correctly into gnuplot version 3.5.  This
mod also add borders options, financial plots, multiple line titles
and other asundry items.  Use at your own risk.  Look at the top of
makefile.r for a more complete list of changes.

From: Alex Woo, woo@playfair.stanford.edu

Miscellaneous Mods

Congp3d3 is a preprocessor to draw contour plots on irregular regions.  
From: mrb2@nrc.gov (Margaret Rose Byrne)

Sockpipe is a socket based pipe needed for the Stardent OS.  
From: Mike Hallesy, Stardent Computer Product Support, hal@stardent.com

Time Series is a patch to add multiline titles and
labels, time series x and y data and tic marks, and automatic resizing
of plots and much more.
From: Hans Olav Eggestad, olav@jordforsk.nlh.no


Other Operationing Systems

MacIntosh Port of Version 3.2
From: Noboru Yamamoto,      sun!kekvax.kek.jp!YAMAMOTO@pixar.com

MacIntosh Port of Version 3.5
From: laval@londres.cma.fr (Philippe LAVAL)

OS-9 Port of Version 3.2
From: Budelsky