Category Archives: Maths

Maximum distance between two points

Posted on 27/11/2010 by dougaj4

I have just written a short User Defined Function (UDF) to find the maximum distance between any two points from a list of coordinates, and since it may be useful to others, I will post it here.  Here is the … Continue reading →

Posted in Coordinate Geometry, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , | 1 Comment

Tanh-Sinh Quadrature Update 2

Posted on 22/11/2010 by dougaj4

I have copied the latest version of Graeme Dennes’ Tanh-Sinh Quadrature spreadsheet to my download site:  Click here to download Tanh-Sinh.zip As before, the download includes full open-source code, and detailed notes by Graeme. In the new version the Gauss-Kronrod function … Continue reading →

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

Revision to CSpline2.xls

Posted on 11/11/2010 by dougaj4

It was recently reported to me that the cubic spline spreadsheet CSpline2.xls (posted here) was crashing on loading in Excel 2003.  It seems that the problem was with the ChartSpline function, and that there are no problems if this function is … Continue reading →

Posted in Drawing, Excel, Maths, UDFs, VBA | Tagged , , | 6 Comments

Tanh-Sinh Quadrature update

Posted on 20/10/2010 by dougaj4

Graeme Dennes has been continuing work on his Tanh-Sinh Quadrature function, and recently sent me a revised version, which can be downloaded from: Tanh-Sinh.zip The main change is a new automatic tolerance adjustment feature which automatically increases the tolerance for … Continue reading →

Posted in Excel, Maths, Newton, Numerical integration, UDFs, VBA | Tagged , , , , , , , | 9 Comments

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