Category Archives: Maths

Daily Download 14: Curve Fitting 1

Posted on 01/10/2012 by dougaj4

Today’s download topic covers fitting a straight line or curve to scattered data, using the “least squares” method.  Fitting a spline curve to pass exactly through a series of points will be covered in a few days. Use of the … Continue reading →

Posted in AlgLib, Charts, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , , | Leave a comment

Daily Download 13: The ALGLIB maths library and Excel

Posted on 30/09/2012 by dougaj4

Today we move onto maths related downloads, starting with the ALGLIB maths library, which has featured here quite frequently: Original post with link to site: ALGLIB Installing AlgLib with Excel VBA Download files: http://interactiveds.com.au/software/AL-Matrix-xlsb.zip   http://interactiveds.com.au/software/AL-Matrix-xls.zip Linking AlgLib C++ to Excel … Continue reading →

Posted in AlgLib, Arrays, Excel, Maths, Newton, Numerical integration, UDFs, VBA | Tagged , , , , , , , | 7 Comments

Tanh-Sinh Quadrature V3.0

Posted on 13/09/2012 by dougaj4

I have received from Graeme Dennes  another update to his Tanh-Sinh Quadrature spreadsheet, offering fast and convenient numerical integration functions.  The spreadsheet can be downloaded from: Tanh-Sinh Quadrature (including, as usual, full open source code). Here is Graeme’s description of the changes: Tanh-Sinh Quadrature … Continue reading →

Posted in Excel, Maths, Newton, Numerical integration, UDFs, VBA | Tagged , , , , | 5 Comments

Alglib Spline Functions 1.32

Posted on 23/07/2012 by dougaj4

Following a comment to AlgLib Spline Functions, the AL-Spline-Matrix spreadsheets have been updated, and may be downloaded from AL-Spline-Matrix03 for Excel 2003 and earlier and AL-Spline-Matrix07 for Excel 2007 and 2010.

Posted in AlgLib, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , , , , , | Leave a comment

Animated Pythagoras

Posted on 13/02/2012 by dougaj4

Two animatations of a “wordless” proof of Pythaoras’ Theorem provided by SSSF regular PM 2Ring. This animation is a “wordless proof” of Pythagoras’ theorem. The basic design is an interlocking pattern of coloured squares overlaid with “shadow” squares. In most … Continue reading →

Posted in Animation, Maths, Newton | Tagged , , , | 4 Comments