# Re: Calling plotutils from xemacs using Ruby GSL

**URL:** <https://www.ruby-forum.com/t/re-calling-plotutils-from-xemacs-using-ruby-gsl/79996>\
**Category:** Ruby\
**Created:** [March 12, 2006, 12:34am UTC](https://www.ruby-forum.com/t/re-calling-plotutils-from-xemacs-using-ruby-gsl/79996 "2006-03-12T00:34:25Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\
**Post date:** [March 12, 2006, 12:34am UTC](https://www.ruby-forum.com/t/re-calling-plotutils-from-xemacs-using-ruby-gsl/79996/1 "2006-03-12T00:34:25Z")

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Just guessing …  
Maybe plotutils cannot be found because its path is not visible ?  
What happens if you run the example from

\_[http://ruby-gsl.sourceforge.net/rnd3.html\_](http://ruby-gsl.sourceforge.net/rnd3.html_)  
([ruby-gsl Sample: rnd3.rb](http://ruby-gsl.sourceforge.net/rnd3.html)) .

If that works out ok, you could execute the graph command  
as an external command, eg. by including it in backticks or  
by calling the system command …

Best regards,

Axel

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<div class="post-metadata">

**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\
**Post date:** [March 12, 2006, 3:39am UTC](https://www.ruby-forum.com/t/re-calling-plotutils-from-xemacs-using-ruby-gsl/79996/2 "2006-03-12T03:39:53Z")

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Thanks Axel:

This was my output, leaving me to believe I have bigger problems, or I’m  
just using IRB incorrectly: Why would it see GSL okay but barf on the  
include for GSL::Random?

Thanks for your time.

#!/usr/local/bin/ruby

require “GSL”  
true  
include GSL::Random  
NameError: uninitialized constant GSL::Random  
from (irb):5

# Test random number distributions

# generate output suitable for graph(1) from GNU plotutils:

# ruby test/rnd3.rb | graph -Tps \> g.ps

STDERR.puts “Running tests for RND(3)…”  
Running tests for RND(3)…  
nil

x = y = 0  
0  
a = []  
[]  
r = RNG.new  
NameError: uninitialized constant RNG  
from (irb):15  
puts “#m=1,S=2”  
#m=1,S=2  
nil  
printf “%g %g\n”, x, y  
0 0  
nil  
10.times do  
a = RND::dir\_2d®  
x += a[0]  
y += a[1]  
printf “%g %g\n”, x, y  
end  
NameError: uninitialized constant RND  
from (irb):19  
from (irb):18

STDERR.puts "\ndone.SyntaxError: compile error  
(irb):25: unterminated string meets end of file  
from (irb):25

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<div class="post-metadata">

**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\
**Post date:** [March 12, 2006, 7:55pm UTC](https://www.ruby-forum.com/t/re-calling-plotutils-from-xemacs-using-ruby-gsl/79996/3 "2006-03-12T19:55:20Z")

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On 3/12/06, Ruby M. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> require “GSL”  
> Running tests for RND(3)…  
> #m=1,S=2  
> NameError: uninitialized constant RND
> 
> > Just guessing …  
> > Best regards,
> > 
> > Axel

In Linux , after some modifications to rnd3.rb  
ruby rnd3.rb | graph -Tps \> g.ps  
works and I can see the graph using Evince Document Viewer after  
ps2pdfwr g.ps to covert it to g.pdf.

Modified rnd3.rb:  
#!/usr/local/bin/ruby

#require “GSL”  
require “gsl”  
require ‘rbgsl’  
#include GSL::Random  
include GSL  
#include RBGSL

# Test random number distributions

# generate output suitable for graph(1) from GNU plotutils:

# ruby test/rnd3.rb | graph -Tps \> g.ps

STDERR.puts “Running tests for RND(3)…”  
x = y = 0  
a = []  
r = Rng.new  
#r = RND.new  
puts “#m=1,S=2”  
printf “%g %g\n”, x, y  
10.times do

# a = RND::dir\_2d(r)

a = Ran::dir\_2d(r)  
x += a[0]  
y += a[1]  
printf “%g %g\n”, x, y  
end

Thanks for the education ,because of you  
Prasad