Indexing through an array

Suppose I have this

B = [1 4 7 10; 2 5 8 11;3 6 9 12]

1   4   7   10
2   5   8   11
3   6   9   12

And I want to check through each column for a value of 2. How would I do this?

[James Tursa]

What do you want as a result? A logical array indicating which columns have a 2 in them? An outline for a for-loop that checks for a 2 in a column? Or ...?

Answer 1

[Walter Roberson]

B = [1 4 7 10; 2 5 8 11;3 6 9 12]

B = 3×4

1 4 7 10 2 5 8 11 3 6 9 12

any(B==2,1)

ans = 1x4 logical array
   1   0   0   0