How can I specify the colormap scalling

I have a colormap as below:

cmap=[0.729  0.752  0.7529;
      0.5689  1  1;
      0.6078  0.8039  1;
      0.3255  0.6627  1;
      0          0.4745  0.949;
      0.7067  1  0.2844;
      0.4756  0.8431  0;
      0   0.6588  0;
      0   0.502  0;
      0          0.3333  0;
      1   1  0;
      0.9961  0.7686  0.4196;
      0.9765  0.6392  0.2667;
      1   0.3922  0.102;
     0.8  0  0;
       1  0  1]

I want to specify a range to the color map as it is done in the figure: Since the last range is not equal to the other i cannot use caxis([cmin cmax]); How can I define the range for each color in showing an image?

Answer 1

[Stephen23]

You need to create a linear correspondence between the colormap intervals and the desired data intervals. You basically have two choices:

1. interpolate that colormap so that it has more colors and those color division occur exactly at the data intervals that you want.
2. adjust the data so that it corresponds linearly to the given colormap. Commands such as mesh support this by an optional input argument, often named C.

Not ideal, and it would be nice to have that ability to specify the intervals...

Note that MatPlotLib does have this ability, if you are really need this.

[midia yousefi]

Thanks I have create the correspondence between colormap and data matrix as below:

colormap(cmap1)
colors=zeros(size(desired_point));

colors(desired_point>=-10 & desired_point<8)=1;

colors(desired_point>=8 & desired_point<12)=2;

colors(desired_point>=12 & desired_point<16)=3;

colors(desired_point>=16 & desired_point<20)=4;

colors(desired_point>=20 & desired_point<24)=5;

colors(desired_point>=24 & desired_point<28)=6;

colors(desired_point>=28 & desired_point<32)=7;

colors(desired_point>=32 & desired_point<36)=8;

colors(desired_point>=36 & desired_point<40)=9;

colors(desired_point>=40 & desired_point<44)=10;

colors(desired_point>=44 & desired_point<48)=11;

colors(desired_point>=48 & desired_point<52)=12;

colors(desired_point>=52 & desired_point<56)=13;

colors(desired_point>=56 & desired_point<60)=14;

colors(desired_point>=60 & desired_point<64)=15;

colors(desired_point>=64 & desired_point<=68)=16;

mesh(x_pixle,y_pixle,desired_point,colors)

colorbar

but the result is not correct. this is the image:

as you see the color assigened to value of the point is not correct.

[Stephen23]

Can you please upload your data by editing your question and clicking the paperclip button.