Fill a vector with specific values from a matrix

Hello, I'd like to identiy which values are greater than 4 in matrix "a" and fill those values into matrix "b". The code I tried was this, but it didn't work.

a=[1 4 23 5

5 2 7 8

3 4 6 3];

for i=1:size(a,1)

for j=1:size(a,2)

if a(i,j) > 4

b(:)=a(i,j)

end

end

end

Answer 1

[Stephen23]

a = [1,4,23,5;5,2,7,8;3,4,6,3];
b = a(a>4)

b = 6×1

5 23 7 6 5 8