Read data in Gnuplot

Question

I have a file with a matrix like :

1 2 3
4 5 6
7 8 9

Using gnuplot, I would like to extract the Variable in the 3th row on the 2th column, and store it in a variable called X for example. please how to do that using gnuplot. Thanks

See http://stackoverflow.com/a/18587275/2604213 or http://stackoverflow.com/a/26925306/2604213 — Christoph, Jul 26 '16 at 16:49

score 0 · Answer 1 · answered Jul 26 '16 at 13:39

You can do that within a plot command,

set table "/dev/null"
X=0
X_row=3
X_col=2
plot "file.dat" using (($0==X_row)?(X=column(X_col),X):0)
unset table

To save time the plot command can do something useful at the same time, like... plotting something.

score 0 · Answer 2 · edited May 23 '17 at 11:58

0

Thanks, It's solved actually using this syntax :

plot u 0:($0==RowIndex?(VariableName=$ColumnIndex):$ColumnIndex)
#RowIndex starts with 0, ColumnIndex starts with 1
print VariableName

It's already explained quite well here : by @StackJack

edited May 23 '17 at 11:58

Community

1
1

answered Jul 26 '16 at 15:39

Zack

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3

I would use `stats`. StackJack's is from a time when that function wasn't yet implemented. – Christoph Jul 26 '16 at 16:52

Read data in Gnuplot

2 Answers2