Ruby and Gnuplot under Windows (was: Re: External applicatio

Ruby
1

Dear Chris,

thanks for pointing me to ruby gnuplot. However, I need to
set up a connection under Windows XP (in addition to one
in Linux).
Now, in the manual of Ruby Gnuplot,
it says:

Gnuplot.open
Instantiates a new Gnuplot process. The path to the executable is
determined
on a Unix or MacOSX system using the which command. Windows users, I
have no
idea what to do. If a block is given to the function the opened process
is
passed into the block. This mimics the most common usage of the
File.open
method.

I want to combine Gnuplot support to an FXRuby application, and
unfortunately,
this always crashes with Segfault when I run it in Cygwin, which used to
be
my way of running Ruby and indeed anything on Windows…
So I tried to install the ruby gnuplot gem (v 2.2) using the gem
installer
of the one-click
installer, and tried this test file:

require ‘rubygems’
require ‘gnuplot’

Gnuplot.open do |gp|
Gnuplot::Plot.new( gp ) do |plot|

plot.xrange “[-10:10]”
plot.title “Sin Wave Example”
plot.ylabel “x”
plot.xlabel “sin(x)”

plot.data << Gnuplot::DataSet.new( “sin(x)” ) do |ds|
ds.with = “lines”
ds.linewidth = 4
end

end

end

Now, the application starts, but just doesn’t do anything - there is
no error message or warning, and no output.
Does anybody use Ruby Gnuplot and the Ruby from the one-click
installer (latest version) successfully ?

Thanks,

Best regards,

Axel

2

[email protected] wrote:

Gnuplot.open
Instantiates a new Gnuplot process. The path to the executable is determined
on a Unix or MacOSX system using the which command. Windows users, I have no
idea what to do. If a block is given to the function the opened process is
passed into the block. This mimics the most common usage of the File.open
method.

Note to author of Gnuplot.open: use File.which, from the ptools
package. It’s cross platform.

Regards,

Dan

3

On Wed, 7 Jun 2006, Daniel B. wrote:

the function the opened process is passed into the block. This mimics the
most common usage of the File.open method.

Note to author of Gnuplot.open: use File.which, from the ptools package.
It’s cross platform.

but doesn’t seem to be in my ruby? where are you getting it?

-a

4

On Wed, 7 Jun 2006, Daniel B. wrote:

gem install ptools :slight_smile:

jib:~ > ruby -W0 -e’ require “rubygems”; require “ptools”; p
File.which(“ls”); ’
“/bin/ls”

very cool. thanks!

-a

5

[email protected] wrote:

executable is determined on a Unix or MacOSX system using the which
-a
gem install ptools :slight_smile:

I thought FileUtils had a ‘which’ equivalent, but I guess I was
mistaken.

Regards,

Dan