Category Archives: UDFs

Faster Integration with the Tanh-Sinh Method

Posted on 10/10/2010 by dougaj4

In my previous post about numerical integration I mentioned that I would be writing about another lesser known method providing better speed and/or accuracy in many cases.  The method is known as Tanh-Sinh quadrature, and has been implemented in Excel by a reader … Continue reading →

Posted in Excel, Maths, Numerical integration, UDFs, VBA | Tagged , , , , , , , | 3 Comments

Working with FEM data and using the dictionary object

Posted on 26/09/2010 by dougaj4

This post features an Excel User Defined Function (UDF) to count the number of different element types (beams, plates, bricks and links) and the number of node restraints at each end of listed beams from a finite element model.  The … Continue reading →

Posted in Arrays, Excel, Finite Element Analysis, Newton, UDFs, VBA | Tagged , , , , , | 5 Comments

PyXLL Links

Posted on 20/09/2010 by dougaj4

This is really just a bookmark for me and anyone else who may be interested. “PyXLL is an Excel addin that enables functions written in Python to be called in Excel.” That’s all I know, but it looks interesting, and … Continue reading →

Posted in Computing - general, Excel, Link to dll, UDFs | Tagged , | 1 Comment

Complex Numbers and Solving Quartic Polynomial Equations

Posted on 19/09/2010 by dougaj4

It was recently pointed out to me that the User Defined Function (UDF) for solving quartic polynomial equations presented in this post returned an error for some input values.  In tracking down the source of the error I decided that it … Continue reading →

Posted in AlgLib, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , | 2 Comments

Eval.xls and the ALGLIB integration functions.

Posted on 11/09/2010 by dougaj4

In a comment on a previous post on numerical integration I mentioned that I might implement the ALGLIB integration functions using the same technique, that is using the VBA Evaluate function to evaluate functions entered as text in the spreadsheet.  Well … Continue reading →

Posted in AlgLib, Excel, Maths, Newton, Numerical integration, UDFs, VBA | Tagged , , , , | 4 Comments