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

[Alex van der Spek]

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

[Alex van der Spek]

The obvious smooth unique did not produce the desired result either

gnuplot> plot 'foo.txt' matrix using 1:3 every :SKIP::BEG::END smooth
unique with lines

I am out of thoughts...anyone?
Thanks in advance,
Alex van der Spek

"Alex van der Spek" <zd...@xs4all.nl> wrote in message
news:5213645a$0$15872$e4fe...@news2.news.xs4all.nl...

[sfeam]

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

[Alex van der Spek]

Thanks Ethan,

I figured something along those lines.

I transposed the matrix outside of gnuplot. Then computing the sum/mean is
easy using the sum function.

Regards,
Alex van der Spek


"sfeam" <sf...@users.sourceforge.net> wrote in message
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