Category Archives: VBA

Plotting Ferns

Posted on 27/09/2010 by dougaj4

Over at Daily-Dose-of-Excel mrt has posted an interesting VBA version of a Matlab program that used an Iterated Transfer Function to plot a graph resembling a fern.  The original Matlab code came from Dr Tom Wood, and Michael’s VBA version works just fine, … Continue reading →

Posted in Arrays, Charts, Drawing, Excel, Maths, Newton, VBA | Tagged , , , , | 5 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

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

Excel, ALGLIB, C# and ExcelDNA

Posted on 01/09/2010 by dougaj4

Having just responded to a comment, saying I would be focussing on Add-in Express, rather than ExcelDNA, I have just found a blog post about using the ALGLIB C# routines in Excel, with the aid of ExcelDNA: Parcell’s Posts; Tutorial: … Continue reading →

Posted in Excel, Link to dll, Maths, VBA | Tagged , , , | Leave a comment