# How to replace matrix elements by using statements?

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Hasancan Saral on 3 Oct 2022
Commented: Hasancan Saral on 3 Oct 2022
I have a matrix which has 9x9 size.(mhw1)
so i want to change the elements which higher than 3 to 3 and lower than 1 to 1.
what am i doing wrong?
c=zeros(size(mhw1));
for i = 1:size(mhw1)
if mhw1(i)>.3
c(i)=3;
elseif mhw1(i)<.1
c(i)=1;
end
end

KSSV on 3 Oct 2022
Edited: KSSV on 3 Oct 2022
It is very simple and straight forward. Consider this example.
A = rand(3) ;
A(A<0.3) = 0 ;
A(A>0.8) = 1 ;
Hasancan Saral on 3 Oct 2022
Never thought it that way, that was on me.(forgot to think simple) Thanks for the answer.

Ergin Sezgin on 3 Oct 2022
Hello Hasancan,
You should use both rows and columns in two for loops to check and adjust each element in a 2D matrix.
for i = 1:size(mhw1,1)
for j = 1:size(mhw1,2)
if mhw1(i,j) > 3
mhw1(i,j) = 3;
elseif mhw1(i,j) < 1
mhw1(i,j) = 1;
end
end
end
You can also perform it in a quicker and more efficient way:
mhw1(mhw1>3) = 3
mhw1(mhw1<1) = 1
I hope it helps.
Hasancan Saral on 3 Oct 2022
Thanks for the answer, always forgetting to think simple :)

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