How to change the value of the certain elements in a matrix

Hi all, I want to change elements in an array inside of a matrix. I want all the elements that are less than 5 to be 0. For example

example = 4 8

7 2

2 9

5 3

I want this matrix to be:

0 8

7 2

0 9

5 3

Answer 1

[Hernia Baby]

example = [4 8;7 2;2 9;5 3]

example = 4×2

4 8 7 2 2 9 5 3

idx = example(:,1) < 5

idx = 4×1 logical array
   1
   0
   1
   0

example(idx) = 0

example = 4×2

0 8 7 2 0 9 5 3

If you want to change all elements which is less than 5 to 0,

example = [4 8;7 2;2 9;5 3];
idx = example < 5

idx = 4×2 logical array
   1   0
   0   1
   1   0
   0   1

example(idx) = 0

example = 4×2

0 8 7 0 0 9 5 0

[Omer hakan Yaran]

Thanks for the answer Hernia! It solved the problem.

Answer 2

[Image Analyst]

example =    [4 8
    7 2
    2 9
    5 3];
mask = example < 5;
example(mask) = 0

example = 4×2

0 8 7 0 0 9 5 0

I'm not sure why one of the 2's stayed in your example (since it's less than 5) but to keep all the 2's, you'd do

example =    [4 8
    7 2
    2 9
    5 3];
mask = example < 5 & example > 2;
example(mask) = 0

example = 4×2

0 8 7 2 2 9 5 0

Of course you could do it all in one line of code if you combine things:

example(example < 5 & example > 2) = 0;