Plot two lines in gnuplot

Question

I have file with two columns like:

1.2, 3.4
5.6, 7.8
...

I want gnuplot to plot both columns in one coordinate system like it would, if there was only one column. Meaning: X-axis shows the line numbers, y-axis the values.

Example: The first two points of the two lines are (0, 1.2)and (0, 3.4); the second points (1, 5.6) and (1, 7.8).

I do not want the two columns being treated as x and y values, like it would if just go for plot "data.txt".

Thor · Accepted Answer · 2017-05-04 16:20:13Z

6

You can use the zero pseudo column which holds the current sample number. From help pseudocolumns:

column(0)
    The sequential order of each point within a data set.
    The counter starts at 0 and is reset by two sequential blank

For example:

plot 'data.txt' using 0:1, '' using 0:2

The empty '' uses the same data-source as the previous plot.

edited May 4, 2017 at 16:20

answered Jan 2, 2013 at 10:17

Thor

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2 Comments

mgilson Over a year ago

you might want to explain the pseudo-column 0 as well. That's just as magical as the pseudo-file '' in my opinion :) -- But good answer, +1 from me

Thor Over a year ago

@mgilson: Good point thanks. I've added explanation and reference to the help.

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