Re: Compute values with 'every'

Yes, I obviously overlooked that, sorry.
My plots are now working great and I'm getting lots of information from 
my data.
Again, many thanks Alex,
LG,
Bob

On 03/12/2020 12:02, Alexander Stangl wrote:
> As commented previously you need to filter out also the points when you 
> define the y value.
> So it should read:
> file1 using (($0-3)/4):(int($0)%4 == 0 ? (y=$1,NaN) : int($0)%4 == 3 ? $1/y
> : NaN) title "rr100/rr25" ls 9
> 
> like this it will plot NaN every 1st, 2nd and 4th line of your four line 
> data block and for line 3 it plots the data from line3 divided by data 
> from line 1.
> 
> Best,
> Alex
> 
> On Thu, 3 Dec 2020 at 11:36, Robert von Knobloch <[email protected] 
> <mailto:[email protected]>> wrote:
> 
>     Oh dear! I wrote a little too soon Alex, sorry.
>     The trace looks OK at first and then I realised that it had more
>     plotted
>     points that the number of data samples (twice as many). These are
>     positioned at the integer points of samples on the X axis and also
>     erroneously at 1/3 of the distance between these points. (So at X = 1,
>     1.33, 2 etc..)
>     I cannot see where these points come from , any ideas?
> 
>     LG,
> 
>     Bob
> 
>      > On 02/12/2020 17:00, Alexander Stangl wrote:
>      >> Das sollte jetzt klappen:
>      >> statt using 0:... musst du using (($0-3)/4):... verwenden. Dann
>     plottest
>      >> du die daten gleich wie die anderen.
>      >>
>      >> LG
>      >
>      > Alexander, your solution works perfectly.
>      > Again, many thanks for your efforts.
>      > My knowledge of gnuplot is not as deep as yours.
>      >
>      > I'll post to the list as the topic is closed.
>      > Bob (Robert) von Knobloch.
>      >
>      > Solution:
>      >
>      > set datafile missing NaN
>      > y=NaN
>      > plot  file1 every 4::0 using 1 title "rr25" ls 1, \
>      >       file1 every 4::1 using 1 title "rr50" ls 3, \
>      >       file1 every 4::2 using 1 title "rr75" ls 5, \
>      >       file1 every 4::3 using 1 title "rr100" ls 7, \
>      >       file1 using (($0-3)/4):(int($0)%4 == 0 ? (y=$1) : int($0)%4
>     == 3 ? $1/y
>      > : NaN) title "rr100/rr25" ls 9
>      >
>      >
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