Groups > comp.graphics.apps.gnuplot > #1987

Re: Matrix plotting, sum/average of a sequence of rows?

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From	sfeam <sfeam@users.sourceforge.net>
Newsgroups	comp.graphics.apps.gnuplot
Subject	Re: Matrix plotting, sum/average of a sequence of rows?
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Date	Wed, 21 Aug 2013 08:31:28 -0700
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Alex van der Spek wrote:

> To plot rows from a matrix:
> 
> gnuplot> plot 'foo.txt' matrix using 1:3  every :SKIP::BEG::END with
> lines
> 
> this works well and plots every SKIP rows between BEG and END.
> 
> You would think that plotting the sum of those would be
> 
> gnuplot> plot 'foo.txt' matrix using (sum [n=BEG:END] column(1)):3
> every
> :SKIP::BEG::END with lines
> 
> this plots the same as the first though. Likewise, if the sum is done
> on column 3 this plots the same.
> 
> Thoughts?
> Alex van der Spek

This limitation has nothing to do with matrices.
Gnuplot read, processes, and plots one line at a time.
There is no mechanism for summing a column, because that would
require accessing all the lines at once.

	Ethan

Thread

Matrix plotting, sum/average of a sequence of rows? "Alex van der Spek" <zdoor@xs4all.nl> - 2013-08-20 14:43 +0200
  Re: Matrix plotting, sum/average of a sequence of rows? "Alex van der Spek" <zdoor@xs4all.nl> - 2013-08-20 18:53 +0200
  Re: Matrix plotting, sum/average of a sequence of rows? sfeam <sfeam@users.sourceforge.net> - 2013-08-21 08:31 -0700
    Re: Matrix plotting, sum/average of a sequence of rows? "Alex van der Spek" <zdoor@xs4all.nl> - 2013-08-24 12:37 +0200

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