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MathGroup Archive 1994

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Bug in SplineFit ?

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: Bug in SplineFit ?
  • From: Jean.Peccoud at imag.fr (Jean Peccoud)
  • Date: Tue, 8 Mar 1994 15:35:46 +0100

>
>Dear Mathgroup :
>
>can anybody explain me this amazing behaviour of SplineFit ?

(*w2 is CompositeBezier interpolation of a data set produced by SplineFit
in NumericalMath`SplineFit`*)

>(zenon) In[12]:=
>w2
>
>(zenon) Out[12]=
>SplineFunction[CompositeBezier,{0., 8.},<>]
>
>(zenon) In[13]:=
>w2[5]
>
>(zenon) Out[13]=
>{0.75, 1.80523}
>
>(zenon) In[15]:=
>FindRoot[w2[x][[1]]==0.76, {x, 5}, MaxIterations->1000]
>
>(zenon) Out[15]=
>{x -> 5.26073}
>
>(zenon) In[16]:=
>FindRoot[w2[x][[2]]==-1.96, {x, 5}, MaxIterations->1000]
>
>Part::partw: Part 2 of SplineFunction[CompositeBezier,{0., 8.},<>][x] does not
>exist. 
>
(*Why Part2 does not exit*)
>
>Part::pspec: Part specification #2 is neither an integer nor a list of
>non-zero integers.
>
>FindRoot::frjc: Could not symbolically find the Jacobian of {w2[x][[2]] -
>-1.96}
>    . Try giving two starting values for each variable.
>
>(zenon) Out[16]=
>FindRoot[w2[x][[2]] == -1.96, {x, 5}, MaxIterations -> 1000]

Thank you for helping me.




-----------------------------------
Jean Peccoud                                        
TIMC-IMAG                                          
Faculte de medecine de Grenoble         
F-38700 La Tronche
France

tel : (33) 76 63 71 85
fax : (33) 76 51 86 67
E-mail : Jean.Peccoud at imag.fr







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