Author Archives: dougaj4

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

The Weaver and the Factory Maid

Posted on 02/04/2011 by dougaj4

This is an old Steeleye Span song, a favourite of mine, cleverly combining two 19th century weavers songs. The You Tube presentation is noteworthy for two rareities, a video that adds something to the song, and a collection of mostly … Continue reading →

Posted in Bach | Tagged , | 2 Comments

PView Function

Posted on 31/03/2011 by dougaj4

As promised in the previous post, here are further details of the PView User Defined Function (UDF), included in the IP2 spreadsheet, which can be downloaded (including full open source code) from IP2.ZIP. The PView UDF works by multiplying the 3D … Continue reading →

Posted in Arrays, Charts, Charts, Coordinate Geometry, Drawing, Excel, Maths, UDFs, VBA | Tagged , , , , , , | 3 Comments

More 3D Intersections and 3D plotting function

Posted on 28/03/2011 by dougaj4

Following the previous post, I have added several new functions connected with intersections of lines and planes, and a function to generate a perspective plot from 3D coordinates.  The new functions have been added to the IP2.xls worksheet, which can … Continue reading →

Posted in Coordinate Geometry, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , , | 7 Comments