Divide elements of matrix by scalar

for i = 1:N
        P(i) = P(i)/2;
end 

I have this for loop that's supposed to divide each element of P by two, then I graph P but it's always double what it needs to be. N is 120 and P is a 1x120 array so it's not an indexing problem.

When I isolate my P array in another script and divide each element by 2 my graph looks how I want it to

Why won't my intial code divide by 2? Any help is greatly appreciated.

Answer 1

[the cyclist]

Are you doing this for loop inside a function? If so, the operation you are doing is only on the local copy of P. You need to output that new value of P from the function. Something like

function P = divideByTwo(P)

for i = 1:N
    P(i) = P(i)/2;
end

end

[Sarah Gomez]

Yea, I fixed my problem everything was inside a loop. Took my loop out and eveyrthing worked. Thank you though!