Author Archives: dougaj4

Using Frame4Buckle with the Alglib solver

Posted on 01/03/2014 by dougaj4

The Frame4Buckle spreadsheet carries out a buckling analysis of a column or strut, which may be divided into any number of segments with varying cross section details, allowing the analysis of stepped or tapered members.  The spreadsheet includes a VBA … Continue reading →

Posted in AlgLib, Computing - general, Finite Element Analysis, Frame Analysis, Link to dll, Newton, VBA | Tagged , , , , , | 5 Comments

Rabbits, Foxes, and Lorenz Attractors

Posted on 23/02/2014 by dougaj4

Following comments here and here I have added two examples to the ODE Solver spreadsheet showing use of the ODE function to solve systems of differential equations with two or more coupled equations. The new version (including full open source … Continue reading →

Posted in AlgLib, Differential Equations, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , , , | 2 Comments

Skydrive becomes Onedrive

Posted on 21/02/2014 by dougaj4

As noted in the previous post, the free on-line disc space provided by Microsoft is no longer called Skydrive, but is now known as Onedrive.  On this occasion the change is not due to a desperate bid by their marketing … Continue reading →

Posted in Computing - general | Tagged , , , | 1 Comment

6 Year Report

Posted on 21/02/2014 by dougaj4

As in previous years, I have downloaded the statistics for this blog for the previous year, and pasted them into a worksheet. The link to each post is preserved in the spreadsheet, so it makes a convenient index to what … Continue reading →

Posted in Bach, Excel, Newton | Tagged | Leave a comment

Cubic splines with horizontal data

Posted on 16/02/2014 by dougaj4

Following a request here I have modified my cubic spline functions to accept input arranged  in rows as well as columns.  By default the output arrays will have the same orientation as the range of interpolation X values, but I have also added … Continue reading →

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