From: Sky Yin <sky.yin@...>
Date: 2005-12-12T05:24:03+09:00
Subject: Re: Equation graphing software?

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A ruby noob question: If I want to run an external program within ruby code
(instead of running it outside like the example you gave), how can I pass a
string through the pipeline to the program?

Thanks

On 12/9/05, Eric Lavigne <lavigne.eric@gmail.com> wrote:
>
> >Does Ruby have any modules useful in graphing equations like y=3Dx**2+5,
> >y**2+x**2=3D16, 4y+3x=3D28, and the like?
>
> gnuplot does this: http://gnuplot.info/
> Gnuplot can create your graphs as files or display them on the screen.
> Gnuplot is ordinarily used as a standalone program which reads a
> script, but you can make it work with your program by putting gnuplot
> at the end of a pipeline. Your program writes gnuplot commands to
> standard-out:
>
> ruby myprog.rb | gnuplot
>
> If you need to do something more complicated (or if your OS doesn't
> support pipes), creating an object that acts as an output stream to a
> gnuplot process would be fairly easy.
>
>
>

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