From: soxinbox <faker@...>
Date: 2005-10-21T23:32:01+09:00
Subject: Re: gnuplot on ruby

gordon, It looks like the gnuplot executable on windows needs to be 
pgnuplot.exe. Might I suggest that when on windows you set cmd = "pgnuplot" 
and assume it is in the path. I don't know the ruby way to check for 
platform, perhaps ENV["OS"].downcase.include?("win") or some such hack.

<gordon.j.miller@gmail.com> wrote in message 
news:1129898636.033794.322130@z14g2000cwz.googlegroups.com...
> Ara.T.Howard wrote:
>> On Fri, 21 Oct 2005, soxinbox wrote:
>>
>> > I installed gnuplot gem, and I am getting some syntax errors when I try 
>> > to
>> > run the samples on the projects web page.
>> >
>> >> ruby test.rb
>> > c:/programs/ruby/lib/ruby/gems/1.8/gems/gnuplot-2.1/lib/gnuplot.rb:20:in
>> > `popen': No such file or directory - which gnuplot (Errno::ENOENT)
>> > from
>>
>> it looks like the code must do
>>
>>    IO::popen `which gnuplot`
>>
>> so either
>>
>>    - gnuplot is not on your system
>>
>>    - gnuplot is not in your path
>>
>> can you verify both of these?  from the shell do
>>
>>    ~:> which -a gnuplot
>>
>
> Ara is completely correct with his diagnosis.  You have two choices,
> either ensure that gnuplot is in your path or hardcode the path in the
> gnuplot.rb file.  I've struggled for a number of years on how to
> improvie this but haven't been able to come up with something better
> that satisfies my sense of right and wrong.  Suggestions would be
> appreciated.
>
> Gordon
>