[Bug-gsl] interpolation function

[Michael Ng]

Dear gurus,
   I am using the following function to get interpolation points in a 
3D surface. I am doing it for the sake of finding the intersection line 
between two surfaces:

   gsl_spline_eval(spline, x, acc);

   Unfortunately, the abave line failed to work when the data 'x' is a 
constant, since it is from a flat surface. I understand that x has to be 
in ascending order, but I hope to find a quick fix when x is a constant...
  
   Thanks for your valuable advices.

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Regards,
Michael Ng