[SciPy-user] scipy.interpolate.Rbf() MemoryError for more than 4000 (x, y) pairs ?

Jim Vickroy Jim.Vickroy@noaa....
Fri Apr 3 10:40:49 CDT 2009

Hello Group,

I'm a radial basis functions novice so I may be making a mistake; 
however, it seems that scipy.interpolate.Rbf() can handle a maximum of 
~4000 (x,y) points.  Is that correct?

Here is a sample output from the attached script (rbf-demo.py) for 5000 
(x,y) points:

Python version: 2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 
bit (Intel)]
numpy version:  1.2.1
scipy version:  0.7.0
multiquadric         in-painting required 200 seconds for 5000 points
Traceback (most recent call last):
 File "rbf-demo.py", line 28, in <module>
   rbf   = scipy.interpolate.Rbf(x, y, z, function=function)
 File "C:\Python25\lib\site-packages\scipy\interpolate\rbf.py", line 
132, in __init__
   r = self._call_norm(self.xi, self.xi)
 File "C:\Python25\lib\site-packages\scipy\interpolate\rbf.py", line 
147, in _call_norm
   return self.norm(x1, x2)
 File "C:\Python25\lib\site-packages\scipy\interpolate\rbf.py", line 
100, in _euclidean_norm
   return sqrt( ((x1 - x2)**2).sum(axis=0) )


-- jv

I'm considering using Rbf to replace a horizontal band of bad-pixel 
values in 512x512 images obtained from a damaged detector.
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