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Changing color map to show different points in a matrix

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Raza
Raza 2019-2-17
评论： Raza 2019-2-17
I have a matrix of size a = (45x45), I am trying to plot it using contourf(). I am having a problem when I apply colorbar and colormap to my data because it does not represent all the values present in the data, instead it just shows the highest and lowest value. If my data is in the range [-1 1], it just shows that every thing is just -1 or 1. I am using 'jet' colormap. Whenever I plot it using surf() function it shows all the different values with different colors which is what i want but I want it in 2D and also I dont want the mesh in it.
here is the code I have:
contourf(a);
title('a');
colormap(jet(128));
caxis([-1 1]);
colorbar;
Any help would be appreciated.
Thank you.
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