curve fitting : Error computing Delaunay triangulation. Please try again with different data.

dear all

i have data point like below :

s =

         0    0.0200    0.0400    0.0600    0.0800
y =

     0     0     0     0     0
h =

   1.0e-03 *

         0   -0.0578   -0.2061   -0.4013   -0.6146

and i want to fite smooth curve and not a surface from these data for example using interpolant and cubic method if possible or smth els

when i use matlab tool box i got this error :

Error computing Delaunay triangulation. Please try again with different data.

and i really apreciated if some one can help me to do this in cod and not matlab toolbox and how can Restrict the data range from 0 to my last point mean :[0.08 0 -0.6146]

[shahin hashemi]

and i should mention that i want this curve fitting in 3 dimension