How to plot heat map using MATLAB?

I have matrix with dimensions [4096, 181], I want to draw a heatmap for such matrix as in the following figure. How can i do so?

Answer 1

[Chunru]

a = peaks(40);
imagesc(a)
colormap(hsv(512))
colorbar

[Abdelwahab Afifi]

Is it possible to adjust the colorbar to include the red colour?

[Chunru]

use colormap as shown above

[Abdelwahab Afifi]

I noticed that there is a red colour at the top and bottom of the colour map. this causes confusion. is it possible to limit the colour map exactly as in the pic I attached?

[Abdelwahab Afifi]

I got it

colormap turbo
colorbar