Test different number(values or label) in matrix?

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REN
REN 2011-3-3
hello, I want to detect different number in matrix?
for exmaple in a matrix:
0 0 0 0 0 0 0;
3 3 0 0 0 0 0;
3 3 3 0 0 0 0;
0 0 0 0 4 4 4;
0 0 5 5 0 0 0;
5 5 5 5 5 0 0;
How can I know the number of different values in this matrix, and index for any elements with same value?
Can I use function 'diff'?

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采纳的回答

Paulo Silva
Paulo Silva 2011-3-3
number of different values, A is your matrix
numel(unique(A))
All code:
a=[0 0 0 0 0 0 0
3 3 0 0 0 0 0
3 3 3 0 0 0 0
0 0 0 0 4 4 4
0 0 5 5 0 0 0
5 5 5 5 5 0 0];
b=unique(a)
for i=2:numel(b)
c=find(a==b(i))';
fprintf('The value %d appears %d times, indices %s\n',b(i),numel(c),num2str(c))
end

更多回答（1 个）

Matt Fig
Matt Fig 2011-3-3
A = [0 0 0 0 0 0 0;
3 3 0 0 0 0 0;
3 3 3 0 0 0 0;
0 0 0 0 4 4 4;
0 0 5 5 0 0 0;
5 5 5 5 5 0 0]
U = unique(A); % Has the unique elements of A.
LU = length(U); % Has the number of unique elements of A.
[L,I] = histc(A(:).',U) % Has the counts per element and locations.

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