How to save the location of particular element of a MATRIX?

I have a 10 x 10 matrix

A = [ 0 1 2 3 4 5 6 7 8 9;

1 2 3 4 5 6 7 8 9 0;

2 3 3 5 6 7 8 9 0 1;

3 3 3 6 7 8 9 0 1 3;

3 3 3 7 8 9 3 3 3 3;

3 6 7 3 9 0 3 3 3 3;

3 7 8 3 0 1 3 3 3 3;

7 8 9 3 1 3 3 4 5 3;

8 9 0 1 3 3 4 5 6 7;

9 0 1 2 3 4 5 6 7 8];

I need to save the location of element 3 in each column in a new matrix

Answer 1

[Image Analyst]

To get the row and column of each location the 3 appears in the matrix, use find()

A = [ 0 1 2 3 4 5 6 7 8 9; 
    1 2 3 4 5 6 7 8 9 0; 
    2 3 3 5 6 7 8 9 0 1; 
    3 3 3 6 7 8 9 0 1 3;
    3 3 3 7 8 9 3 3 3 3;
    3 6 7 3 9 0 3 3 3 3;
    3 7 8 3 0 1 3 3 3 3;
    7 8 9 3 1 3 3 4 5 3;
    8 9 0 1 3 3 4 5 6 7;
    9 0 1 2 3 4 5 6 7 8];
[rows, columns] = find(A == 3)

rows = 34×1

4 5 6 7 3 4 5 2 3 4

columns = 34×1

1 1 1 1 2 2 2 3 3 3