Fill a vector with specific values from a matrix

2021 11 6
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更新时间：2021 11 6
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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

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