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Problem wit cubic spline


Hello:
  I'm using Mathematica 5 and I'm having some problems with SplineFit
I run :
<<NumericalMath`SplineFit`

pts = {{0,0},{1,2},{-1,3},{0,1},{3,0}};


spline = SplineFit[pts, Cubic]


SplineFit[{{0,0},{1,2},{-1,3},{0,1},{3,0}},Cubic]

That is, it didn't recognize the last command...The graphic doesn't  
work either.
With Bezier (or CompositeBezier) there is no problem.

spline = SplineFit[pts, Bezier]

SplineFunction[\[InvisibleSpace]Bezier\[InvisibleSpace], \[InvisibleSpace]{0.,
      4.}\[InvisibleSpace], <>]

And Graphics works fine....
I tried to run the commands directly from the Help Browser and it  
didn't work..

Does anybody has the same problem?
  Thanks in advance

Atte. Andres Guzman



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