How could I recreate the find function

I need to find values in a matrix that equal a given value (10), but I need to know their index/position in the matrix (won't use find function).

so if the matrix a = [2 10 10 5 7 4 10] I want to run my function and get ans = [2 3 7] to find where the 10's are in the first function

Answer 1

[Star Strider]

One approach:

a = [2 10 10 5 7 4 10];
idx = ((a == 10).*[1:numel(a)]);
idx(idx > 0)

If you want to use this with a matrix, you will need to use the reshape function to convert it to a linear vector, and then the ind2sub function to get the row and column indices.