CODEWITHSUNDEEP
gnuplot
ardabro
ardabro

Reputation: 2061

point color dependent on string column value

I'd like to plot simple 2D point graph with dots either red or green, where color is determined by third, string column. This one doesn't compile:

plot "data.txt" using 1:2:3 with points lc rgbcolor (stringcolumn(4) eq "B" ? "green" : "red")

complaining that :

stringcolumn() called from invalid context

Data looks like this:

1,2,"A"
2,3,"A"
3,1,"B"
4,2,"A"

How to do this?

Upvotes: 1

Views: 469

Answers (1)

meuh
meuh

Reputation: 12255

You can do this by assigning a linetype number to each colour, then evaluating column 3 into one of these numbers. Eg:

set linetype 1 lc 'green'
set linetype 2 lc 'red'
plot "data.txt" using 1:2:(stringcolumn(3) eq "B"?1:2) with points lc variable

Note, your data columns must be separated by whitespace not commas.

Upvotes: 2

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