Category Archives: Excel

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 , , , , , , | 3 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

Drawing a Buckyball in Excel

Posted on 04/09/2010 by dougaj4

Since, according to Google, it is the 25th anniversary of the Buckyball, I thought I would draw one in Excel. A quick search found a list of coordinates here: Chemistry resources The problem then was, how to connect them.  The information … Continue reading →

Posted in Drawing, Excel, Maths | Tagged , | 10 Comments