Visualize matrix with colormap in grid

问题

I have a matrix that looks like this:

0.06    -0.22   -0.10   0.68    NaN     -0.33
0.04    -0.07   0.12    0.23    NaN     -0.47
NaN     NaN     NaN     NaN     NaN     0.28
0.37    0.36    0.14    0.58    -0.14   -0.15
NaN     0.11    0.24    0.71    -0.13   NaN
0.57    0.53    0.41    0.65    -0.43   0.03

I want to color in each value based on a colormap. In Python, I know I can use imshow to assign a color to each box. How can I do it in MATLAB?

回答1:

You could use imshow as well, but every pixel would have the size of a pixel of your screen. So you may rather use imagesc.

A =  [...
0.06    -0.22   -0.10   0.68    NaN     -0.33;
0.04    -0.07   0.12    0.23    NaN     -0.47;
NaN     NaN     NaN     NaN     NaN     0.28;
0.37    0.36    0.14    0.58    -0.14   -0.15;
NaN     0.11    0.24    0.71    -0.13   NaN;
0.57    0.53    0.41    0.65    -0.43   0.03 ]

imagesc(A)

And then you can apply any colormap you want or create your own one.

colormap(jet)
colorbar

---

If you don't like how imagesc handles your NaNs consider using pcolor

pcolor(A)
colormap(jet)
colorbar

with shading flat you can get rid of the grid lines.

来源：https://stackoverflow.com/questions/29152793/visualize-matrix-with-colormap-in-grid