Plotting multiple graphs depending on column value with gnuplot

Question

I have the following data, which I wan't to plot using GNUPLOT:

#TIME #VALUE #SOURCE
1 100 A
1 88 B
2 115 A
2 100 B
3 130 A
3 210 B

I want to have two lines drawn, depending on the value of column #SOURCE. One line for A and one line for B. Is this possible with GNUPLOT and if yes how?

Is it possible to also draw a summation of column #VALUE depending over column #TIME? Means, that for all equal entries in #TIME, the values in #VALUE will be summed up.

Thanks in advance, Frank

Possible duplicate of How to plot single/multiple lines depending on values in a column with GNUPlot — Ciro Santilli OurBigBook.com
– Ciro Santilli OurBigBook.com, Commented May 2, 2016 at 18:31

ilent2 · Accepted Answer · 2015-04-18 06:16:46Z

3

One way to do it would be to use grep to locate lines ending with A or B and plot the result. You can do this in a single plot line with a for loop if you know the characters lines will end in:

plot for [s in 'A B'] sprintf("<(grep -v '%s$' data.dat)", s) u 1:2 w l

This plots the data you provided (saved in data.dat) as two different lines.

You could also change the for part to [s in 'word1 word2 word3'] or any other string you like. If you don't know the character/word lines will be ending with you would probably need to pass the file twice first to determine the string for the for loop and a second time to do the plotting.

answered Apr 18, 2015 at 6:16

ilent2

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6 Comments

Aaginor Over a year ago

Thanks for your answer! As I don't know the names of the source, I adapted the routine that writes the datafile. Now I simply have a column for each source (ValueA, ValueB, ...) and plot it with [plot 'file.csv' u 2:1 title 'A', 'file.csv' u 3:1 title 'B', ...

Christoph Over a year ago

See also How to use one of the column of data as legend in gnuplot? for an example how to extract the unique values of a column.

GP92 Over a year ago

plot for [s in 'a b c d e f g'] sprintf("<(grep -v '%s$' testdata1.dat)", s) u 1:3 w l ..... I am getting error: Invalid expression at s. The version is 4.0...why??

GP92 Over a year ago

I have tested the same in windows with 5.0 version but there I am receiving error: can not pipe data....is the piping syntax is different in windows???

ilent2 Over a year ago

I'm not sure if this will work on Windows without bash and grep installed (and running gnuplot from bash with grep in the PATH). There might be some other syntax for pipes on Windows but I'm not sure.

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