Adding numeric values to imagesc

How do I display the actual numeric values of a matrix plotted using 'imagesc'? I would like to have a number displayed in each colored box, representing a value of row and column plotted using 'imagesc' function.

Answer 1

[Image Analyst]

See Steve's blog: http://www.mathworks.com/matlabcentral/fileexchange/32273-im2html-m

[Tasi]

Thanks Steve. If I have a matrix X, dimension 5x7, how do I use your function to get colored boxes with only the value of the matrix inside, not the RGB information? Is there a simple way to add a line to imagesc(X), so that this info would also be displayed?

[Image Analyst]

What is the "value of the matrix inside" if it's not the gray level or RGB information? You cannot build this capability into imagesc() or imshow() since those are built-in functions that you don't want to mess with.

[Tasi]

This is an example of my matrix:

   -4.0257   -2.1029  -60.5863  -23.3115  -18.6019  -11.0004
  -19.5928   -3.1193  -21.1400   -7.0992  -11.3980    3.7057
   -3.8306    0.1967    0.5895    3.3293   -1.1123   -0.3119
    3.9556   -2.1975   -6.3927    1.9462    4.3546   -0.9120
   -2.8013   -5.6693    2.0827  -27.5794   -8.8464  -23.8637

Column 7

-83.9344
-86.2478
-39.9361
-30.2867
-29.6367

I would like these values to be displayed inside the squares I get when I use imagesc, but I am not sure if this can be done with that function.

[Image Analyst]

imagesc() displays pixels. There is no way you can fit all of that into a single pixel and see it on your screen, not even with a microscope. The only way is to blow up the pixels to big patches like I showed you with the im2html program.

Answer 2

[Tamar Regev]

Just use the text function:

M = [1,2,3;4,5,6;7,8,9];

figure

figure

imagesc([1:3],[1:3],M)

set(gca,'XTick',[1:3],'YTick',[1:3],'fontsize',20)

for i = 1:3

for j = 1:3

text(i,j,num2str(M(i,j)),'FontSize',20)

end

end

Answer 3

[Steven Lord]

This function didn't exist when the question was originally asked, but I suspect the original poster had something like heatmap (introduced in release R2017a) in mind.

[Tamar Regev]

gotcha! Good thing that this function exists now :)