Re: [Gnuplot-info] How to ignore "popen failed"?

[ivana r. <iva...@mf...>]

Hi Theo,

what version of gnuplot you are running?

With V5+ and windows 7Pro, I get error message "File not found",
GPVAL_ERRNO is set and gnuplot doesn't exit.

(Then you can decide if plot the graph according to value of
GPVAL_ERRNO or words(FileList))

(Note that since V5.2 gnuplot recognize continue command)

(The empty plot you can get, e.g.: #plot [0:1][0:1] 1/0 not)

Sincerely

Iva

On 27/07/2017, theozh <th...@gm...> wrote:
> Hi,
> I would like to plot many files (under Windows) in a multiplot
> environment using a loop.
> The filenames without extensions are e.g.,
> Data1a, Data1b, Data2, Data3, Data3a, Data3b, Data5a, ...
>
> set multiplot layout 3,3
> do for [i = 1:9] {
>   FileList = system("dir /B /S Data".i."*.dat")
>   plot for [FileName in FileList] FileName u 1:2 w l
> }
> unset multiplot
>
> I want all Data1 in one plot, all Data2 in the next plot, etc.
> It varies how many plots (a,b,c,...) of each.
> However, it could also happen that, e.g. there is no "Data4" file.
>
> In case there is no matching file in the directory gnuplot exits with a
> message "popen failed" and FileList is not changed.
> How to ignore "pope failed" and instead just create an empty plot?
>
> Thank you for any hints.
>
>
>
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