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List:       gnuplot-info
Subject:    Re: [Gnuplot-info] Displaying a bunch of Lines of given Data
From:       Thomas Sefzick <t.sefzick () fz-juelich ! de>
Date:       2009-01-16 9:35:03
Message-ID: 21495510.post () talk ! nabble ! com
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in the development version (4.3) of gnuplot it is possible to determine
the actual position inside a data block - see 'help pseudocolumns' - and
treat data rows differently depending on their position.

e.g.
a=0.5
splot "measurements.dat" w l, "" every 1::0::0 w p, "" us
1:2:(column(0)>0?a*$3:$3) w lp

scaling of 'vectors' between subsequent data points could also be done:

a=0.5
splot "measurements.dat" w l, \
   '' every 1::0::0 w p, \
   '' us \
      (column(0)==0?(x1=$1,$1):x1+($1-x1)*a)\
      :(column(0)==0?(y1=$2,$2):y1+($2-y1)*a)\
      :(column(0)==0?(z1=$3,$3):z1+($3-z1)*a) \
      w lp


H0LL0 wrote:
> 
> Hmmm, I think gnuplot is not able to do this in an easy way. Since I've
> been dealing with gnuplot a couple of days now at work, I think I
> understood how gnuplot works. Although it is quasi Turing complete it is
> not able to do everything you want "out of the box". 
> Anyway my problem isn't present anymore, since I solved it outside of
> gnuplot now, but my solution is less comfortable than I wished.
> 
> I'd still love to do some different Operations on the data before
> displaying it, but if the data is stored in datablocks this doesn't seem
> to be possible. 
> 
> Hence the more detailed question is:
> 
> Do you think there is an alternative way to store the data (like in matrix
> form or sth.), so I can do some operations on it before displaying?
> 

-- 
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 Sent from the Gnuplot - User mailing list archive at Nabble.com.


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