forum.alglib.net

Hello,


i have two functions:

first:
double[] x = { 7.0, 14.0, 20.0 };
double[] y = { 3.0, 6.0, 10.0 };

and the seconde:
double[] x = { 7.0, 14.0, 20.0 };
double[] y = { 3.5, 6.0, 10.0 };

now i want to make an interpolation and get the result and compare this two ones.

but what i have to transfer to the function spline2dbuildbicubic?

_________________________________________________________________________________________________________

/*************************************************************************
This subroutine builds bicubic spline coefficients table.
Input parameters:
X - spline abscissas, array[0..N-1]
Y - spline ordinates, array[0..M-1]
F - function values, array[0..M-1,0..N-1]
M,N - grid size, M>=2, N>=2
Output parameters:
C - spline interpolant
-- ALGLIB PROJECT -- Copyright 05.07.2007 by Bochkanov Sergey
*************************************************************************/
public static void spline2dbuildbicubic( double[] x, double[] y, double[,] f, int m, int n, out spline2dinterpolant c)

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now what is exactly my x, y, f, m, n !?

thanks for your answer!


best regards,
anne

You should use spline1dbuildcubic() to work with your functions. spline2d....() is for 2-dimensional data, and you have 1-dimensional data.

now i have two arrays
double [] handrechtsx;
double [] handrechtsy;

then i make
alglib.spline1dinterpolant c;
alglib.spline1dbuildcubic (handrechtsx, handrechtsy, out c);

and there is an unhandled exception named:

alglib + alglibexception : exception of type 'alglib + alglibexception' was thrown

where is the failure!?
can somebody help me!?