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From: Chris Elvidge <chris@mshome.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: For loop not working as I expected - but now solved
Date: Mon, 19 Feb 2018 12:50:45 +0000
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On 19/02/2018 07:15 am, Karl Ratzsch wrote:
> Am 17.02.2018 um 17:46 schrieb Chris Elvidge:
> 
>> plot [j=1:7] F(8-j) u 1:4 w l lw 2 lc rgb "orange" t "CPU", '' u 1:5 w l
>> lw 2 lc rgb "green" t "GPU"
> 
> The second part of
> 
>     plot [i=1:4] fname(i) us 1:2, '' us 1:2
> 
> cannot work. '' just contains the last file name, in verbatim, that was
> in the plot command. It doesn't expect a function, and especially cannot
> contain the whole iteration. The error message could be a bit clearer,
> but obviously nobody thought of the specific misuse you tried. ;-)
> 
> You have to repeat the iteration :
> 
>   plot [i=1:4] fname(i) us 1:2 w lc i, for [i=1:4] fname(i) us 1:2 w lc i
> 
> 
> Best, Karl
> 

Sorry Karl, that didn't work either. But thanks for pointing out the 
need for the second "for [i=1:4]" bit.

However, this did work:

F(n) = system("date -d\"-".n." days\" 
\"+/var/tmp/cpu-gpu-temp_%Y%m%d.dat\"")
plot for [j=1:7] F(8-j) u 1:4 w l lw 2 lc rgb "orange" noti, for [j=1:7] 
F(8-j) u 1:5 w l lw 2 lc rgb "web-green" noti

Note the extra "for" after the plot command. Could this be a bug in the 
manual?

Strangely, with "plot for" and '' as the second file specifier, I get 
all the files for the first plot, but only the last file for the second 
plot.

Cheers

-- 

Chris Elvidge, England