@weightless

Ok.
Triangular wave - is the sum of sinusuids with levels:
1 0 -0.111111 0 0.04 0 -0.0284082 0 0.0123457 0 -0.0892646 ...

here there are negative values. how I can get - calculate - these negative values. I'm just very far from this FFT ...

@weightless Thanks - this is what I need
)

Hello !
I need to determine the level of harmonics (for example - 10 harmonics) in a sample (one wave period, for example - one period of a triangular wave length of 512 samples) - how can this be done quickly?