[Gnuplot-py-users] Problem working with xtics

[Roberto Rodríguez-R. <ro...@gm...>]

Hi, I need to do a bar graph with categories, I found these example

http://www.ibm.com/developerworks/aix/library/au-gnuplot/index.html

I need to do something similar, for many data. I tried to replicate
the example on python. I wrote the respective code I append it at the
end of the message.

but I got these error:
  File "./graph.py", line 119
    g.plot(data using 2:xtic(1) title "Oct-09 data growth(gb)", ''
using 3 title "Nov-09 data growth(gb)", '' using 4 title "Dec-09 data
growth(gb)")
                    ^
SyntaxError: invalid syntax

The function fileopen2 is just for parsing the file with the data, I
got a matrix wich I tried to graph. The problem is with the plot
command, I don't know how to manage categories with gnuplot.py, I have
looking in the web in several places but all the examples don't touch
these part.

these is my code

#! /usr/bin/env python

import Gnuplot, Gnuplot.funcutils, sys
import sys
import re
import math

#*******************************************************************************
def plot2D(data):
        print sys.maxint
        g = Gnuplot.Gnuplot() #persist=1)
        g.title('Memory writes')
        g('set terminal png truecolor')
        g('set grid')
        g('set style data histograms') # give gnuplot an arbitrary command
        g('set style fill solid 1.00 border -1')
        g('set xlabel "page_number"')
        g('set ylabel "number of writes"')
        g('set autoscale')
        g.plot(data using 2:xtic(1) title "Oct-09 data growth(gb)", ''
using 3 title "Nov-09 data growth(gb)", '' using 4 title "Dec-09 data
growth(gb)")
        g.hardcopy("blah.png",terminal="png")
        raw_input('Press enter to continue...\n')
#*******************************************************************************

#*******************************************************************************
def file_open2(DataFile):
#Open the file
#       print "open"
        try:
                data_file = open(DataFile, "r") #open the file
                data_points=data_file.read() #save the file in a list
                line_points=data_points.split('\n') #split the file by new lines
                data_file.close()
        except IOError, e:
                print >> sys.stderr, "File Open Error:", e
                sys.exit(2)

        reg_exp=re.compile(r"\s+") #reg_exp for separate each token in the list
        mem=[[]]
        print "Putting data in an array"
        for i in range(len(line_points)-1):
                mem_line=reg_exp.split(line_points[i])
                for j in range(len(mem_line)):
                        if j==0:
                                mem[i].append((mem_line[j]))
                        else:
                                mem[i].append(float(mem_line[j]))
                mem.append([])
        mem.pop()
        return mem
#*******************************************************************************

if __name__ == '__main__':
        plot2D(file_open2(sys.argv[1]))


the file that have the data contains:

hdisk2 420 425 410
hdisk3 700 780 760
hdisk4 450 450 452
hdisk5 680 702 690
hdisk6 320 330 329
hdisk7 530 515 514

I really appreciate any help. Thank you

-- 
Best Regards
             Roberto