[Scipy-tickets] [SciPy] #772: interpolate.Rbf: for 'gaussian' mode, the epsilon parameter is reciprocal

SciPy scipy-tickets@scipy....
Sat Nov 1 07:12:38 CDT 2008


#772: interpolate.Rbf: for 'gaussian' mode, the epsilon parameter is reciprocal
-------------------------------+--------------------------------------------
 Reporter:  pv                 |       Owner:  somebody
     Type:  defect             |      Status:  new     
 Priority:  normal             |   Milestone:          
Component:  scipy.interpolate  |     Version:          
 Severity:  normal             |    Keywords:          
-------------------------------+--------------------------------------------
 The epsilon parameter for interpolate.Rbf determines the width of the
 interpolant basis functions:

     'multiquadric': sqrt((r/self.epsilon)**2 + 1)
     'gaussian': exp(-(self.epsilon*r)**2)

 The default value is the mean node separation.

 However, the gaussian basis functions use 1/epsilon as the function width,
 whereas multiquadrics use epsilon. I think also the gaussian functions
 should use epsilon, not 1/epsilon, as their width.

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Ticket URL: <http://scipy.org/scipy/scipy/ticket/772>
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