MATHCAD - how do I change a function f(x) to a vector so that I can use it in subsequent evaluations (e.g. interpolate)?

I have a time domain function (damped sine) in MATHCAD that needs to be fft, then attenuated by a frequency dependent vector. To do that I need to:

- perform fft on function

- interpolate the fft with the attenuation

I have tried VECTORIZED with no success. Can anyone help with creating a vector/matrix from a function?