How do I plot custom coloured lines?

[tuananhle7]

I want to plot three lines on the same plot like this

gnuplot.plot(
   {"Training", epochs, trainLosses, "-"},
   {"Validation", epochs, valLosses, "-"},
   {"Test", epochs, testLosses, "-"}
)

but with custom colours. Is this possible?

[ltrottier]

You can add gnuplot string style like this:

gnuplot.plot(
   {"Training", epochs, trainLosses, 'with line lt 5'},
   {"Validation", epochs, valLosses, 'with line lt rgb "magenta"'},
   {"Test", epochs, testLosses, 'with line lt rgb "#FFF000"'}
)

You have different choices, for instance with a predefined color number, gnuplot's named colors or hexadecimal. See here for example http://gnuplot.sourceforge.net/docs_4.2/node62.html