For/if loop for adding up only odd numbers

Hi,

We're supposed to write a loop (it must be a loop!) to calculate the following expression (see attached image). We're supposed to only sum the values that correspond to odd values of n.

This is what I got so far but I don't know how to specifiy that only only odd values for n are added.

for n = 1:100

c(n) = (1/(n^2));

sum(c);

end

Can anybody help me with that please?

Thanks,

Debbie

Answer 1

[Yongjian Feng]

You mean this?

for n = 1:100
  if mod(n,2) == 1
    c = (1/(n^2));
    sum(c);
  end
end

Refer to this for how to compute remainder in matlab.

[Dobs]

Yes, thank you! So is mod similar to rem?

[Yongjian Feng]

Little bit different for negative value. Same for positive:

matlab answer