From: Nuralanur@...
Date: 2006-03-12T22:39:23+09:00
Subject: Re: Calling plotutils from xemacs using Ruby GSL

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Sorry, I actually wanted to say something else in my last mail,
letting you try 
 
> ruby rnd3.rb | graph -Tps > g.ps ,
 
which works out for me. It sends the results from ruby to the  external
GNU program "graph" , which is part of the plotutils package.
I can then open the file g.ps with ghostscript (gv,ggv or whatever).
 
The errors  
 
NameError: uninitialized constant RND etc.. 
 
you reported come from the fact that Ruby does not know what these  constants
are, and after some digging into the description of rb-gsl, I found
out that there are two ways of requiring rb-gsl,
 
require "rbgsl" or require "gsl",
 
one of these forms lets you drop everything before the '::' , so you  can
use  
 
a=dir_2d(r) 
 
instead of 

a = RND::dir_2d(r) .
 
Maybe the author changed his mind on which form of require to  associate
with which form in between...
 
But I still am not able to run the first program you posted, either,
where I also get the error
 
graph([x,y], [roots.real,zero], "-T X -C -g 3 -S 4")
NoMethodError: GNU  plotutils required
from (irb):7:in `graph'
from (irb):7

you reported. I do not know how to fix this directly, but for  me,  it worked
out to patch that by piping the results of a ruby program into graph  as 
above.
 
Sorry I can't help any further -maybe more experienced users of  plotting
with plotutils under rb-gsl are willing to help out ?
 
Best regards,
 
Axel 
 
 






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