MATLAB Answers

Maximum scaling resolution of colormap for colorbar to be correct

4 views (last 30 days)
Hannes Mogensen
Hannes Mogensen on 2 Dec 2016
I am experimenting with a function for using several colormaps in the same surface plot - e.g one colormap scaling for values < 0, another one for values between 0 and 1 and a third for values > 1.
I have used the following code as a proof of concept:
clear
clf('reset')
[x, y, z] = peaks(30);
surface(x, y, z);
n1 = 512;
n2 = 512;
cbar_mapping = [spring(n1); bone(n2)];
colormap(cbar_mapping);
colorbar
The function above generates the following figure.
In the final function I will set the values of variables n1, n2, ... , so that the relative contribution of each colormap will be assigned to the different regions of z, as described above. The higher the total value of n1 + n2+ ..., the better the range for each colormap will be pinpointed. However, if for instance I set n1 = 1024, n2 = 1024 in the code snippet above the colorbar will be faulty:
Questions: 1) Is this a bug, or a limitation implemented on purpose to fulfill another constraint?
2) Can the maximal sum of values n1 + n2 + ... be determined?
  8 Comments
David Goodmanson
David Goodmanson on 5 Jan 2017
Thanks Hannes. I and several other folks will be interested to know what is going on once you find out.

Sign in to comment.

Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!