Documentation

Coherence function. This function computes the coherence from the power spectra of two time series and the cross spectrum between them. The result array (data_length/2)*sizeof(float) for real (unheterodyned) input data and data_length*sizeof(float) for complex (heterodyned) data.

Returns:

s 0 if successful, -1 if error

Parameters:

data_length - the number of frequency bins in the data set
data_type - DATA_REAL, if the original time datas were unheterodyned, DATA_COMPLEX if the time datas had been hetrodyned.
pxxdata - the power spectrum of the first (x) data set. An array of datalength floats for datalength bins of power spectrum data for the first (x) data set.
pyydata - same as pxxdata for the second (y) data set.
pxydata - the cross spectrum between the two data sets. An array of datalength pairs of floats for datalength complex cross spectrum data points.
result - the coherence result

Author:

Edward Daw, July 1999