Author Archives: dougaj4

Is Hinchliffe’s Rule True? …

Posted on 30/08/2014 by dougaj4

… is the title of a paper by Boris Peon. Here is the abstract: Hinchliffe has asserted that whenever the title of a paper is a question with a yes/no answer, the answer is always no. This paper demonstrates that … Continue reading →

Posted in Newton | Tagged | 2 Comments

Long Lost, a WW1 short film …

Posted on 26/08/2014 by dougaj4

… and crowd-funded production, directed by my daughter: The story of the project At the start of 2014, sparked by the funding opportunity Raw Nerve (A Metroscreen and Screen Australia initiative) Kerinne Jenkins (director), Harry Windsor (writer) and Nic Douglas … Continue reading →

Posted in Bach, Films | Tagged , , | Leave a comment

Numerical Integration; Tanh-Sinh Quadrature v. 4.2

Posted on 23/08/2014 by dougaj4

The latest version (4.2) of the numerical integration spreadsheet by Graeme Dennes is now available for download from Tanh_Sinh Quadrature. For more details of the background see: Faster Integration with the Tanh-Sinh Method and subsequent posts on this subject. In addition to … Continue reading →

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

Solving polynomials – update

Posted on 14/08/2014 by dougaj4

The polynomial spreadsheet (details here) provides functions to solve polynomial equations of any order; using an “exact” method for up to quartic, and an iterative procedure for higher orders.  The input for the functions requires the equation coefficients to be … Continue reading →

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

Faster Biaxial Bending

Posted on 10/08/2014 by dougaj4

The spreadsheet to calculate ultimate moment capacity of a reinforced or prestressed concrete section under combined axial load and biaxial bending, last presented here, has been updated to use the QuadBrent solver, rather than the Excel Goal Seek function, for … Continue reading →

Posted in Beam Bending, Concrete, Excel, Newton, UDFs, VBA | Tagged , , , , , , , , | 1 Comment