cross_correlation
cross_correlation(x, y)Cross-correlation of two series.
Mirrors the C# Fourier.Correlation: an FFT-based correlation, NOT a normalized correlation coefficient (see :func:correlation for that). Both series must have the same power-of-two length.
Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| x | array_like | Equal, power-of-two length. | required |
| y | array_like | Equal, power-of-two length. | required |
Returns
| Name | Type | Description |
|---|---|---|
| numpy.ndarray | Wraparound order: increasing positive lags in [0] up to [n/2 - 1], increasing negative lags in [n-1] down to [n/2]. |
Examples
>>> from corehydropy import cross_correlation
>>> len(cross_correlation([1, 2, 3, 4], [4, 3, 2, 1]))
4