Category Archives: UDFs

Using the AlgLib ODE (Runge-Kutta) Solver with Excel

Posted on 18/06/2010 by dougaj4

Or to be more correct, the AlgLib Cash-Karp Solver, Cash-Karp being a refinement of the Runge-Kutta method of solving ordinary differential equations. Solution of differential equations is an iterative process requiring the repeated application of the solver routine followed by evaluation of … Continue reading →

Posted in AlgLib, Beam Bending, Differential Equations, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , , , | 8 Comments

AlgLib Spline Functions

Posted on 07/06/2010 by dougaj4

Following earlier posts on cubic splines I have collected the Alglib interpolation routines, and the necessary supporting routines, and written interface functions to allow most of the 1Dspline routines to be called from the spreadsheet.  Since there is a large measure … Continue reading →

Posted in Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , , , , , | 6 Comments

P-Y Curve function

Posted on 02/06/2010 by dougaj4

The pile lateral load analysis program presented in a previous post used linear elastic spring supports to model the restraint provided by the soil.  Soil stress/strain behaviour is of course highly non-linear, and this post presents an Excel User Defined Function … Continue reading →

Posted in Excel, Geotechnical Engineering, Newton, UDFs, VBA | Tagged , , , , , | 21 Comments

Compiled AlgLib Matrix Functions for Excel

Posted on 27/05/2010 by dougaj4

This post describes a series of matrix functions compiled from the AlgLib library code (covered in previous posts) as a dll that can be called from Excel VBA, and used as User Defined Functions (UDFs).  A spreadsheet containing the necessary VBA … Continue reading →

Posted in Arrays, Excel, Link to dll, Maths, Newton, UDFs, VBA | Tagged , , , , , , | 18 Comments

Linking AlgLib C++ to Excel VBA

Posted on 22/05/2010 by dougaj4

The previous post described how to install AlgLib VBA routines in Excel.  It is also possible to make AlgLib c++ routines (compiled as dll’s) available from Excel, either from VBA, or using User Defined Functions (UDFs) directly from the spreadsheet.  Using compiled dll … Continue reading →

Posted in Excel, Link to dll, Maths, Newton, UDFs, VBA | Tagged , , , , , , , | 4 Comments