The syntax is

plot x lc rgb "black", x/2 lc rgb "red"

You missed the "lc" specifier.



Am 21.02.2024 um 14:21 schrieb db:

Here is a mini example

gnuplot << eoi
set term postscript enh color eps 24
set output 'mini.eps'
set xlabel "x"
plot x w p pt 7 rgb 'black', \
     x/2 w p pt 7 rgb 'red'
quit
eoi
gv mini.eps

This baulks at the first "rgb":

gnuplot> plot x w p pt 7 rgb 'black',      x/2 w p pt 7 rgb 'red'
                         ^
         line 0: unexpected or unrecognized token: rgb

But if I leave out the second plot line (and terminate
the first properly (no ", \)) it gives me a plot of
a lot of blue points.
Why can't I have several coloured plots?

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