How to resize array using a mask

I have got an array a = { 1 , 2 , 3 ; 4 , 5 , 6 ; 7 , 8 , 9 }

also have a mask, mask = { 1 ; 0 ; 1 }

If I do a*mask, I want the resulting array = { 1 , 2 , 3 ; 7 , 8 , 9 }

Any suggestions on how to implement this?

Answer 1

[Walter Roberson]

a(logical(cell2mat(mask)),:)

Answer 2

[Ameer Hamza]

a = [1 , 2 , 3 ; 4 , 5 , 6 ; 7 , 8 , 9];
b = [ 1; 0; 1];

c = a(b==1, :);

Answer 3

[Image Analyst]

Assuming you're using double arrays...(since I see no need for you to be using cell arrays).

a = [1, 2, 3; 4, 5, 6; 7, 8, 9]
mask = [1; 0; 1]
masked_a = a(logical(mask), :)