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gnuplot values with different colors

Niransha answered on February 18, 2023 Popularity 6/10 Helpfulness 2/10

answer gnuplot values with different colors

gnuplot values with different colors

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### variable line color
reset session

#cat data.dat
1 1.2  1  
2 1.4  1
3 1.6  1
4 1.9 2
5 2  2
6 2.1 2
7 2.4 2

#set print

plot 'plot_gnu_data.dat' u 1:2:(int($3/1)) with points pointtype 6 pointsize 0.2 lc var
									^x-axis colors based on 3rd column
												
### end of code

pause -1
  
########################

1 Red
2 Green
3 Blue
4 Yellow
5 Cyan
6 Magenta
7 Orange
8 Violet
9 Aqua
10 Brown

plot $Data using 1:2:(int($3)-1) with points pt 7 lc variable

The -(int($3)-1) expression is used to map the third column of the data to a color index that can be used by lc variable.

The int($3) function returns the integer value of the third column, and then -(int($3)-1) subtracts the integer value of the third column by 1 and then negates the result. The resulting expression ensures that the color index is always between 0 and 9, which corresponds to the 10 colors available in gnuplot.

For example, if the third column value is 1, then the expression evaluates to -0, which corresponds to the first color (red). If the third column value is 10, then the expression evaluates to -9, which corresponds to the last color (brown).

So, the -1 value in the expression is subtracted to ensure that the color index values are between 0 and 9, instead of between -1 and 8.

Popularity 6/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: colors gnuplot whatever

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Contributed on Feb 18 2023

Niransha

0 Answers Avg Quality 2/10

gnuplot values with different colors

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