CODEWITHSUNDEEP
plotrangegnuplot
Meir Zeilig-Hess
Meir Zeilig-Hess

Reputation: 95

How to force color range in gnuplot

I'm using Gnuplot 4.6. I have data files each containing 3 columns of data: X coordinate, Y coordinate and temperature. I wish to make an animation of plots of temperature as a function of X and Y coordinates. For this I'm using the following script:

set pm3d map; set palette;
do for [n=0:200] {splot sprintf("Temperature.%04d.dbl", n) binary array=100:100:1 form="%double" title 'file number'.n}

My problem is with the fact that after a few plots, the distribution of colors changes, both in the plot and in the legend. This makes the reading from the graph really hard. I consulted the following post:

gnuplot heat map color range

and since the range of the temperature variable is from 0.0 to 1.2 I thought to use:

set zrange [0.0:1.2]; set cbrange [0.0:1.2];

but it doesn't help and the temperature color continues to be autoscaled from plot to plot. Any suggestions?

Upvotes: 5

Views: 5374

Answers (1)

F. Knorr
F. Knorr

Reputation: 3055

In addition to setting cbrange, you could try defining your own palette by

set palette defined (0 "black",\
                     0.2 "red",\
                     0.4 "orange-red",\
                     0.6 "orange",\
                     0.8 "yellow",\
                     1.0 "light-green",\
                     1.2 "green")

enter image description here

Or if you want discrete values:

set palette defined (0 "black",\
                     0.2 "black",\
                     0.2 "red",\
                     0.4 "red",\
                     0.4 "orange-red",\
                     0.6 "orange-red",\
                     0.6 "orange",\
                     0.8 "orange",\
                     0.8 "yellow",\
                     1.0 "yellow",\
                     1.0 "light-green",\
                     1.2 "light-green")

enter image description here

Upvotes: 5

Related Questions