Removing row of a nx3 matrix if at any row the 3rd column is 0

I tried doing this using a for loop and come to realise it is impossible to, can anyone tell me a way to remove a row of a matrix if the condition is met

for example:

b = 
1 2 0
3 4 5
3 2 -1
5 6 0
1 3 6

with the above matrix b, how do I go thru each row and check if the 3rd column is either less than or equal to 0 and remove it?

Answer 1

[David Fletcher]

b = [1 2 0;3 4 5;3 2 -1;5 6 0;1 3 6]

b = 5×3

1 2 0 3 4 5 3 2 -1 5 6 0 1 3 6

idx=b(:,3)<=0

idx = 5×1 logical array
   1
   0
   1
   1
   0

b(idx,:)=[]

b = 2×3

3 4 5 1 3 6

[Quoc Khang Doan]

ty sir