MATLAB: Why doesn’t limitation this work

errorforloopmatrix

So I've got another loop which makes a new matrix called nn. The values in nn varies a lot. The only interesting interval is between 300 and 1300 so I made this loop to remove all values outside the interval.
for i=1:length(nn)
    if nn(i) < 300 || nn(i) >  1300
        nn(i) = [ ];
    end
end
I get this message:
Index exceeds matrix dimensions.
Error in HRV (line 60)
    if nn(i) < 300 || nn(i) >  1300
I don't know what the problem is. Please help

Best Answer

for i=length(nn):-1:1
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