GnuPlot draw line between points with different color for the same dataset

Question

I have a dataset that represents the points while creating a circle (multiple circles), like so:

    gnuplot <<-EOF
        set autoscale
        plot "$file"  w lp 
EOF

I would like to express the point creation timestamps with colors, so let's give a number to every color, starting from red to blue, from 1 to SAMPLE_COUNT; I need to draw lines between points:

#point_0 -> color: 1 -> #point_1
#point_1 -> color: 2 -> #point_2

and so on. In the end, I'd like to get something like:

Can we make this with GnuPlot?

theozh · Accepted Answer · 2023-01-12 12:15:07Z

1

You can do this with variable linecolor (lc) and palette z (check help lc). You are using the pseudocolumn 0 (check help pseudocolumns), i.e. basically the line index, as range for the color palette. If you don't want to see the colorbox add a line unset colorbox.

Script:

### variable line color via palette z
reset session

# create some test data
set table $Data
    plot [0:4*pi] '+' u ($1*cos(x)):($1*sin(x)) w table
unset table

set size ratio -1
set palette defined (0 "red", 1 "orange", 2 "yellow", 3 "green", 4 "cyan", 5 "blue")

plot $Data u 1:2:0 w lp pt 7 lc palette z
### end of script

Result:

answered Jan 12, 2023 at 12:15

theozh

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1 Comment

ceremcem Over a year ago

Result is here: i.sstatic.net/Gu5Aa.png Thank you.

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