How to use a colormap to paint a matrix in matplot with [0, 1] ranges?

[jcbritobr]

Hello, good evening.
I would like to know how I cant paint a random matrix in matplot with values ranging from 0.1. Matplot always will paint it with black because the lower values (0.3, 0.45…)

[mottelet]

Hello,

Matplot input values are indices in the current colormap, hence to represent values between 0 and 1 you have to multiply actual values by the current number of colors available in the colormap, e.g.

a = rand(50,50);
N = 128;
gcf().color_map = jetcolormap(N);
Matplot(ceil(a*N))

[jcbritobr]

Hello. Thank you. Very nice solution.