Very Computer

I need Unix (Linux) program to produce histograms and pie charts.
The program should be able to display charts in X windows. Also,
I need to print the charts, so some well known file format support
(that means PostScript and/or gpic) is required. Color charts at
least on display are preferred.

The following programs I have checked out and they don't seem
good enough:
        gnuplot: this can't display pie charts (or can it?)
        gpic: this has no chart plotting features built in,
              also it can fill only simple objects (circles and boxes)

I have found an article about program called grap and that may be
what I'm looking for. Problem is that I don't know where I could
find it and is it freely distributable.

This program is needed as part of a project, so I can't use
commercial programs.

Riku Turkia

for histograms, set the boxes style

|>   gnuplot: this can't display pie charts (or can it?)

sure....

  set polar
  set size 0.721,1.0
  set nozeroaxis
  set noytics      
  set parametric
  set data style line
  plot 1 notit, 'pie.dat' 1

just add a few 'set label' commands and you're almost there.

The "trick" is to format your data properly. For hints, see
the following quick hack that I used to produce pie.dat:

#include<stdio.h>
#include<math.h>
main()
{
  float data[5];
  int i, n=5;
  float asum=0, sum=0;

  data[0]=4.0; data[1]=7.0; data[2]=9.0; data[3]=4.0;

  for(i=0;i<n;++i)
    sum+=data[i];
  for(i=0;i<n;++i)
  {
     asum+=data[i]/sum*360;  /* might need to use a different starting angle */
     /* probably should sort the data - see style guides in the literature
        for plotting pie charts */
     printf("0 0\n%g %g\n\n", asum, 1.0);
  }

Quote:}

  data[0]=4.0; data[1]=7.0; data[2]=9.0; data[3]=4.0;
  for(i=0;i<n;++i) sum+=data[i];
  for(i=0;i<n;++i)
  {
     asum+=data[i]/sum*360;
     printf("0 0\n%g %g\n\n", asum, 1.0);
  }

Quote:}

|> I have found an article about program called grap and that may be

grap is part of documenters workbench (DWB) from at&t.

--
James Darrell McCauley, Purdue Univ, West Lafayette, IN 47907-1146, USA

** will finish PhD/engr in 9/94 - need job. inquiries welcome (no hh, plz) **
** Personal WWW page URL ftp://pasture.ecn.purdue.edu/pub/mccauley/me.html **