[Gnuplot-info] Histogram/Bar Plot Troubles

[arnold4life <chr...@ho...>]

Hi all, 

I'm a novice with gnuplot and I'm trying to make a histogram or bar plot
that looks like the following:
http://old.nabble.com/file/p30208070/grades.png 

but I can't for the life of me get a gnuplot script to do this. I can get
frequency on the y-axis but I want to get a percentage, and my male/female
columns overlap with the same color on output:
http://old.nabble.com/file/p30208070/grades.jpg 

The data file I'm using has one column of male percentages and one of female
percentages. Here's my horrible script: 

set term postscript 
set output 'grades.ps' 

bin_width = 20.0	
set style fill solid 1.00 border -10 
set style data boxes 
#set style boxes cluster gap 1 
set bmargin 10 
set ylabel "Percentage of Students" 
set xlabel "Grade Percentage" 
set yrange [0.0:140.0] 
#set xtics ("100%-125%" 100.0:125.0, "75%-99%" 75.0:99.0, "50%-74%"
50.0:74.0, "25%-50%" 25.0:50.0, "0%-24%" 0.0:24.0) 
set xtics 20 
bin_number(x) = floor(x/bin_width) 
rounded(x) = bin_width * ( bin_number(x)) 
UNITY = 1 
plot 'grades_distribution.data' u (rounded($1)):(UNITY) t 'Male' smooth
frequency w boxes fs solid 5,\ 
        '' u (rounded($2)):(UNITY) t 'Female' smooth frequency w boxes fs
solid 3 


Any help is greatly appreciated, thanks!

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