GNUplot

MALDATA · 08-13-2009, 10:52 AM

Is there a way to plot only a subset of a column of data in gnuplot? As an example, I have data files that look like this:

Code:

Col1 Col2 Col3
1    0.11 0.11
2    0.11 0.18
3    0.22 0.19
4    0.25 0.20
5    0.28 0.22
6    0.11 0.24
7    0.11 0.11

If I want to plot columns 1 vs 2 and 1 vs 3 WITHOUT the points that are 0.11, how can I do this? I can't just delete the values from the text file because if it sees

Code:

Col1 Col2 Col3
2         0.18
3    0.22 0.19
4    0.25 0.20
5    0.28 0.22
6         0.24

Then row 2 associates 0.18 with column 2 instead of 3, and row 6 uses 0.24 with column 2 instead of column 3.

As it is, all I can do is split the data file into several files, one for each column, and delete the entire row. This seems messy... there's gotta be a better way, but my googling has turned up nothing. Isn't there a way to specify row ranges to use for each column?

Please let me know what I'm missing.

Thanks!

ddffnn · 08-13-2009, 04:32 PM

Replace 0.11 with ?:

Code:

Col1 Col2 Col3
1    ?    ?
2    ?    0.18
3    0.22 0.19
4    0.25 0.20
5    0.28 0.22
6    ?    0.24
7    ?    ?

Geremia · 03-11-2015, 12:11 PM

http://stackoverflow.com/a/18239133/1429450

Quote:

Yes. See the every keyword description on page 78 of the gnuplot manual:

http://www.gnuplot.info/docs_4.6/gnuplot.pdf

E.g.

Code:

plot "data.txt" every ::a:A:b:B

should plot data points a through b in data blocks A through B.