Change sign of every second element of a vector

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am
am 2019-3-22
编辑： madhan ravi 2019-3-22
Hi,
I want to change the sign of every second element in a vector, starting from element two. I tried the following code. Can someone explain why it does not work and help me to fix it? Thank you!
function newVector = change(v)
for i = 1:length(v)-1
newVector(i) = v(i);
newVector(i+1) = v(i+1)*-1;
end
v = newVector
end

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KSSV
KSSV 2019-3-22
编辑：KSSV 2019-3-22
A = rand(10,1) ;
A(2:2:end) = -A(2:2:end)
If you wat to your function, you should use like this:
function newVector = change(v)
newVector = v ;
for i = 1:length(v)
if ~mod(i,2)
newVector(i) = -v(i);
end
end
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KSSV
KSSV 2019-3-22
@am You can see that I have a given a snippet using loop also..you may compare your code and the present one and you can analyse the problem in your code. Like this you can learn on your own. Coding need not to be explained....it should be learnt on your own.

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