How to plot this figure?

This figure is used to show the matrix 300*3. I do not know how to plot this figure? can someone help me? Thanks.

Answer 1

[Mathieu NOE]

hu

try this and adapt to your own needs

a = rand(300,3);
figure,imagesc(a);colormap('jet');colorbar

[z cy]

Thanks！！！

I find this function pcolor also can achieve similar figure.