Author Archives: dougaj4

Beware of the mod

Posted on 22/04/2011 by dougaj4

Playing with a simple VBA user defined function (UDF), inspired by a thread at Daily Dose of Excel, I was finding it was mysteriously giving the wrong answer. The task was to find the angle between the hands of an … Continue reading →

Posted in Excel, UDFs, VBA | Tagged , , | 2 Comments

Calling Add-in functions from VBA

Posted on 16/04/2011 by dougaj4

When an Excel add-in is active any User Defined Functions (UDFs) in the add-in are available to any other open worksheet.  It might be expected that the same would apply to VBA routines defined in other files, but if you … Continue reading →

Posted in Excel, UDFs, VBA | Tagged , , , , | 2 Comments

XLW

Posted on 13/04/2011 by dougaj4

Prompted by a thread at The Wilmott Forums that linked here, I was prompted to take a look at XLW- A Wrapper for the Excel API.  This is what they say about themselves: “XLW is an open source application that … Continue reading →

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

Alternative IP and Rotations

Posted on 11/04/2011 by dougaj4

In response to the 3D Intersections and PView Function posts Lori Miller has sent me two very elegant alternative ways of achieving similar results. The first is an on-spreadsheet solution to the intersection of two lines, using the LinEst function: Note … Continue reading →

Posted in Arrays, Charts, Charts, Coordinate Geometry, Excel | Tagged , , , | Leave a comment

Tanh-Sinh Quadrature V2.0

Posted on 04/04/2011 by dougaj4

I recently received an update of the Tanh-Sinh Quadrature spreadsheet from Graeme Dennes, which can be downloaded from:  Tanh-Sinh Quadrature (including, as usual, full open source code). – Link fixed 5th April 2011 Here is Graeme’s description of the updates: The … Continue reading →

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