calculates the harmonic mean of data elements.
y = nan_harmmean(x [,DIM [,W]])
harmonic mean
dimension
first DIMENSION, with more than 1 element
weights to compute weighted mean (default: [])
The harmonic mean is the inverse of the mean of the inverse elements.
Is the same as y = nan_mean(x,'H' [,DIM [,W]])
features: - can deal with NaN's (missing values) - weighting of data - dimension argument also in Octave - compatible to Matlab and Octave