cross_wt (pyleoclim.utils.wavelet.cross_wt)

pyleoclim.utils.wavelet.cross_wt(coeff1, coeff2)[source]

Return the cross wavelet transform.

Parameters

  • coeff1 (array) – the first of two sets of wavelet transform coefficients in the form of a1 + a2*1j

  • coeff2 (array) – the second of two sets of wavelet transform coefficients in the form of a1 + a2*1j

  • freq (array) – vector of frequency

  • tau (array') – the evenly-spaced time points, namely the time shift for wavelet analysis

Returns

  • xw_amplitude (array) – the cross wavelet amplitude

  • xw_phase (array) – the cross wavelet phase

References

Grinsted, A., Moore, J. C. & Jevrejeva, S. Application of the cross wavelet transform and wavelet coherence to geophysical time series. Nonlin. Processes Geophys. 11, 561–566 (2004).