"Plot" a matrix

Hello, dear members of this community! Can someone help me?

I have an array whose entries represent energy. Would I like to "plot" this array using a color palette, so you can quickly see the regions of high concentration of energy and also the low concentration of energy.

How can I do that? I thank anyone who can help.

Regards,

Answer 1

[Star Strider]

There are several options, contour, contourf, surf, surfc, and others that those documentation pages link to. They will all take matrix arguments. Also see the colormap function to choose the color map that best depicts your data.

[Luciano Magrini]

But these functions are not to generate 3D graphics?

In my case, I just want transform matrix on a color map.

Sorry for my comment, but I am new to matlab. Thank you for your contribution.

[Star Strider]

the surf and similar functions will generate 3D graphics. The contour and related functions do not. It depends on what you want. Also, you can get a 2D surf plot with appropriate settings of the view function.

I encourage you to experiment with them and use the one that produces the result you want. I cannot determine that. I can only refer you to the appropriate functions.

Answer 2

[Walter Roberson]

imagesc(YourArray)
colormap(hot(256))

Answer 3

[Image Analyst]

If you don't want 3D-ish graphics, then just use imshow(). It's in base MATLAB now. If you don't have it, use image() or imagesc().

imshow(yourMatrix, []);
colormap(jet(256));  % There are a variety of other built-in colormaps beyond jet.
colorbar;

Otherwise, see if any of the plots in the "MATLAB Gallery" are what you want: http://www.mathworks.com/discovery/gallery.html