ALGLIB Levenberg-Marquardt algorithm for multivariate optimization

newbtemple · #1 February 3rd, 2009, 07:06 PM

Has anyone used this? I'm trying to convert the C# version to VB.net and i'm kinda clueless on how code this section:

Quote:

/*
This members must be defined by you:
static void funcvecjac(ref double[] x,
ref double[] fvec,
ref double[,] fjac,
ref int iflag)
*/

Functions in vb.net return a value to a variable. There is no return field on the declaration line and it's used as a sub in the following code. I'm not sure what i'm supposed to do with this part of the code.

TIA

newbtemple · #2 February 3rd, 2009, 07:07 PM

http://www.alglib.net/optimization/l...gmarquardt.php

JosAH · #3 February 4th, 2009, 11:42 AM

Quote:

Originally Posted by newbtemple

Functions in vb.net return a value to a variable. There is no return field on the declaration line and it's used as a sub in the following code. I'm not sure what i'm supposed to do with this part of the code.

Your question is not about the Levenberg-Marquardt algorithm but about passing parameters either by value or by reference. A void method in C# or Java is equivalent to ignoring any return value in vb.net. If I remember well vb has the ByRef and ByVal modifiers for parameters. Check your manual.

kind regards,

Jos

ALGLIB Levenberg-Marquardt algorithm for multivariate optimization

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