Re: [Gnuplot-info] variable defined from reading a file?

[Jon <dev...@gm...>]

Thanks for the sample code. I tested it and get an error like

if (i==0) eval "plot 'ts.dat' using
(mu".i."=column(1),sigma".i."=column(2),0/0):(0/0)"
                   ^
         "ts.loop", line 2: invalid command

Seems that the current version of gnuplot does not recognize eval command?!
The version for my gnuplot is 4.2 with patchlevel 3

I did a google search, but does not lead me anywhere ...

Thanks for further information!

Jon



On Thu, Nov 4, 2010 at 6:20 AM, Thomas Sefzick <t.s...@fz...>wrote:

>
> plot in a loop using the 'reload' command and store the mu and sigma values
> in variables specific to each sub-plot:
>
> file 'ts.plt':
>
> ###############
> i=0
> f(x,mu,sigma)=exp(-(x-mu)**2/2/sigma**2)/sqrt(2*pi)/sigma
> load 'ts.loop'
> ###############
>
> file 'ts.loop':
>
> ###############
> if (i==0) \
> eval "plot 'ts.dat' using
> (mu".i."=column(1),sigma".i."=column(2),0/0):(0/0)
> every ::".i."::".i." notitle, f(x,mu".i.",sigma".i.")" \
> ; else \
> eval "replot 'ts.dat' using
> (mu".i."=column(1),sigma".i."=column(2),0/0):(0/0) every ::".i."::".i."
> notitle, f(x,mu".i.",sigma".i.")"
>
> i=i+1
> reread
> ###############
>
> start it with:
>
> load 'ts.plt'
>
>
> bsmile wrote:
> >
> > Hello,
> >
> > So far gnuplot has given me many surprises, and expanded my horizon how
> > much
> > it can do. Now comes one more thing I am wondering whether gnuplot can
> do.
> >
> > For example, I save mu and sigma in a file
> >
> > #   mu   sigma
> >     0.1    0.1
> >     0.1   0.2
> >     0.1  0.3
> >    0.2   0.1
> >    0.2   0.2
> > ...
> >
> > I want to read the first line and assign them to two variables mu and
> > sigma,
> > then plot
> >
> > f(x,mu,sigma)=exp(-(x-mu)**2/2/sigma**2)/sqrt(2*pi)/sigma
> >
> > and then read the next line and assign to mu and sigma, and plot the next
> > Gaussian distribution again
> >
> > ...
> >
> > If this can be done, that would give great flexibility to gnuplot,
> >
> > Thanks for any advices,
> >
> > Sincerely,
> > Jon
> >
> ------------------------------------------------------------------------------
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>
> --
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>
>
>
> ------------------------------------------------------------------------------
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> David G. Thomson, author of the best-selling book "Blueprint to a
> Billion" shares his insights and actions to help propel your
> business during the next growth cycle. Listen Now!
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