Calculating the percentage in a matrix

I have a matrix

A=[1 2 1

   2 2 3

   1 1 2 ]

In this i want to calculate percentage for all values ,in this matrix i have three values 1,2,3

so the percentage must be

1-44.44%

2-44.44%

3-11.11%

please help

Answer 1

[Honglei Chen]

Here is one way to do it in MATLAB

A = [1 2 1;2 2 3;1 1 2];
[ua,~,uaidx] = unique(A(:));
uapercent = accumarray(uaidx,ones(numel(uaidx),1))/numel(uaidx);
[ua uapercent]

But if you have Statistics Toolbox, you can simply do

tabulate(A(:))

[Matt Fig]

[ua,~,uaidx] = unique(A(:));
upercent = histc(uaidx,ua)/length(uaidx)