AndrewWave.psi(z)
[source]
The psi function for Andrew’s wave
The analytic derivative of rho
Parameters: | z (array-like) – 1d array |
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Returns: |
psi – psi(z) = sin(z/a) for |z| <= a*pi psi(z) = 0 for |z| > a*pi |
Return type: | array |
© 2009–2012 Statsmodels Developers
© 2006–2008 Scipy Developers
© 2006 Jonathan E. Taylor
Licensed under the 3-clause BSD License.
http://www.statsmodels.org/stable/generated/statsmodels.robust.norms.AndrewWave.psi.html