Re: [Gnuplot-info] Compute values with 'every'

[Alexander S. <ma...@st...>]

Hey,

what about:

y=NaN
plot    file1 every 4::0 using 1 title "25" ls 1, \
        file1 every 4::1 using 1 title "50" ls 3, \
        file1 every 4::2 using 1 title "75" ls 5, \
        file1 every 4::3 using 1 title "100" ls 7, \
        file1 u 0:(int($0)%4==0 ? y=$1 : int($0)%4==2 ? $1*y : NaN) t
"50*100"

Best,
Alex

On Tue, 1 Dec 2020 at 15:18, Robert von Knobloch <bo...@en...> wrote:

> Hi,
> I am plotting groups of 4 lines of data.
> I can plot the first datum of each line using:
>
> plot    file1 every 4::0 using 1 title "25" ls 1, \
>         file1 every 4::1 using 1 title "50" ls 3, \
>         file1 every 4::2 using 1 title "75" ls 5, \
>         file1 every 4::3 using 1 title "100" ls 7
>
> Which works fine for the whole file of 50 or so entries
>
> What I would like to be able to do is to add a computed line e.g. the
> result of datum#1 in the first of the 4 block multiplied by datum#1 of
> the third block (for the whole file).
>
> Is there a method of doing this?
>
> Regards,
> Robert von Knobloch
>
>
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