[Gnuplot-info] Coloring multi-column plot by column number

[Debostuti G. <deb...@gm...>]

Hi

I have a data set (input.dat) which looks as below:

#C1     C2    C3 ...   C250
1          -2.1    -1.9...  -1.1
2
.
.
.
10       -0.9    1.3        1.7

My intention was that points 1 to 10 will be joined in each column to form
each plot, and therefore I'll have a 249-line plot. This I am able to
achieve by the following:

N = system("awk 'NR==1{print NF}' input.dat")
plot for [i=2:N] "input.dat" u 1:i with lines title "" linewidth 2

Using this I obtain a plot where each line is plotted with a different
color. I want the plots to be colored by a defined palette where the range
is the column number itself, i.e., C2 will be the lightest blue and C250
the darkest blue, since the columns are arranged based on a factor.

Appreciate any help in this regard.

Thank you


-- 
Debostuti Ghosh Dastidar
DST SERB National Post-Doctoral Fellow
Molecular Biophysics Unit
Indian Institute of Science, Bangalore