xarray_fft

File Purpose: fft of xarrays.

Functions

xarray_fftN(array[, dim, ds, rad, abs, ...])	calculates fft(array) along N dimensions.
xarray_ifftN(array[, dim, df, rad, ...])	calculates ifft(array) along N dimensions.
xarray_lowpass(array[, dim, keep, keep_r, ...])	return array after putting it through a lowpass filter using fft & ifft.