How to find the indexes of a matrix which has zero elements as well

How to find the indexes of a matrix which can have any number of columns and which has zero elements as well

For Example: A=[1 0 0;0 1 0;0 0 1] (here A has 3 columns) or A =[0 0 0 1; 1 0 0 1;0 0 0 0; 1 1 0 0; 1 1 1 1] (here A has 4 columns)

[dpb]

Which indices would it be you're looking for????

Taking a stab

doc find % comes to mind, maybe??

[Pavithra Naidu]

Thanks for the reply,but find function finds the indices of only non-zero elements

[Steven Lord]

We don't understand what you're looking for. For the second example you posted, what SPECIFICALLY do you want to be returned as the list of "indexes of a matrix" and why did you select those particular elements of the matrix?

Answer 1

[Thorsten]

It is not entirely clear to me what you want.

The linear indices of a matrix A are

reshape(1:numel(A), size(A))

To find the indices of zeros in A, use

ind = find(A == 0);