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set the line colur value from a file

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  set the line colur value from a file anees.alhamzawi@gmail.com - 2017-05-25 17:31 -0700
    Re: set the line colur value from a file Karl Ratzsch <mail.kfr@gmx.net> - 2017-05-26 04:56 +0200

#3649 — set the line colur value from a file

Dear All,

I am trying to plot vectors with different colours. The colour value is stored as a third column in the data file.

For example, let us say the datafile is "a.tx" contains

0.603358	2.022173	1
1.08929	        2.039982	2
1.588976	2.040512	3

The typical plot is 

plot 'a.txt' using 1:1:($2-$1):(0) notitle with vectors heads size screen 0.008,90 lc 2

The question is that How could the "lc" has the third column value?

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#3650

Am 26.05.2017 um 02:31 schrieb anees.alhamzawi@gmail.com:

> I am trying to plot vectors with different colours. The colour value is stored as a third column in the data file.

> The question is that How could the "lc" has the third column value?
> 

By giving the special keyword "variable" to "lc" and giving the
third column as en extra fifth value for the "using" specifier,
check "help vectors". That works for a number of other plot styles
as well.

  plot fname us 1:1:($2-$1):(1):3 with vectors lc variable

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