Feature to extract from spike waveforms

Supported features

• 'gpca': Global PCA (common principal vectors across all sites). P.nPcPerChan sets the number of components per channel (default: 1).
• 'pca': Local PCA (unique principal vectors per site)
• 'cov': Covariance feature
• 'vpp': Peak-to-peak spike amplitudes
• 'vmin': Minimum spike amplitude
• 'vminmax': minimum and Maximum spike amplitudes (2 features/site)
• 'energy': SD of spike waveform

See also Parameters struct (P)