How to select odd numbers in a row

Hi, I need to write a function that returns an output, which is the square root of the mean of the squares of the first nn positive odd integers. nn is a positive integer and is the only input argument. If nn is 3, my function needs to compute and return the square root of the average of the numbers 1, 9, and 25. (Because 1, 3 and 5 are the first 3 odd integers)

So far I have:

function orms = odd_rms(nn)

h=[1:nn]

h=h.*h

orms=(sum(h(:)))

orms=sqrt(orms/nn)

end

However, I am not sure how to select the odd numbers only. I tried using mod, but that didn't work. Maybe I used it wrong. I am also not supposed to use the built-in function rms.

Thanks a lot!!!

Answer 1

[Image Analyst]

You computed "h" incorrectly. The correct equation is:

h = 1 : 2 : nn*2

Answer 2

[Star Strider]

Consider the definition of an odd number, and go from there. The rem or mod functions could be helpful.