Category Archives: Maths

The statement below is false

Posted on 20/12/2012 by dougaj4

If you think I’m wrong, try looking at it from a different perspective. The picture above came from an optical illusion blog at: http://www.anopticalillusion.com/ and I was led there from: http://www.josleys.com/index.php which is an amazing collection of mathematical imagery by … Continue reading →

Posted in Bach, Maths, Newton, Ray Tracing | Tagged , , , , | Leave a comment

Compiled Matrix Functions for Excel

Posted on 12/11/2012 by dougaj4

This is a follow on from the previous post, showing how the C# version of the ALGLIB maths library can be accessed from Excel, with very little additional coding.  The download file, Matrixdll-c#.zip includes compiled .dll and .tlb files which can be used … Continue reading →

Posted in AlgLib, Arrays, Excel, Finite Element Analysis, Frame Analysis, Link to dll, Maths, Newton, UDFs, VBA | Tagged , , , , , , , , , , , | 4 Comments

Polynomial Update

Posted on 30/10/2012 by dougaj4

Following a comment here: Solving cubic and quartic equations with Excel the Quartic and CubicC User Defined Functions (UDFs) have been amended to fix a problem occurring with some combinations of coefficients. The updated spreadsheet (including full open source code) can be … Continue reading →

Posted in Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , , | 12 Comments

Daily Download 28: The Hole Through the Middle of the Earth, using ODE solvers, and Three Blokes

Posted on 16/10/2012 by dougaj4

Today’s download is based on a series of posts on the “hole through the middle of the Earth”, which by devious means has been tied in with the solution of differential equations, buckling of columns, and a story by Bill … Continue reading →

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

Daily Download 26: Moving averages and prime numbers

Posted on 13/10/2012 by dougaj4

Today’s downloads are the last of the maths related functions: http://interactiveds.com.au/software/MovAv.zip provides a User Defined Function (UDF) to return the moving average of a set of data, and http://www.interactiveds.com.au/software/Primes.zip is a UDF to either generate a set of prime numbers between specified … Continue reading →

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