Category Archives: VBA

AlgLib Complex Number Functions

Posted on 11/08/2010 by dougaj4

The AlgLib module ap.bas includes complex number functions which can be called from other VBA routines, but they cannot be used as User Defined Functions (UDFs)  because they use the user defined data type “Complex”: To  call these functions from the … Continue reading →

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

Buckling of columns with varying cross section

Posted on 09/08/2010 by dougaj4

Following a post in the Eng-Tips Forum about finding the buckling load of a stepped strut I have modified the Frame4 spreadsheet to carry out a buckling analysis of any straight member subject to axial load, including stepped or tapered cross … Continue reading →

Posted in Beam Bending, Excel, Frame Analysis, Newton, VBA | Tagged , , , , , , , | 27 Comments

Solving cubic and quartic equations with Excel

Posted on 04/08/2010 by dougaj4

Although in earlier posts (such as this one) I have referred to some User Defined Functions (UDFs)  for solving cubic and quartic equations, I just realised recently that I haven’t actually talked about them here, and since they are in … Continue reading →

Posted in Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , | 24 Comments

The hole through the middle of the Earth – moved to the Equator

Posted on 02/08/2010 by dougaj4

Previous posts in this series assumed that the hole went from pole to pole, and ignored such complications as tidal effects and wobbles of the axis of rotation.  In this post we will examine the effect of moving the hole … Continue reading →

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

Code Generator

Posted on 22/07/2010 by dougaj4

One of the difficulties with Excel routines to solve differential equations, or do numerical integration, is that the equations to be solved must either be coded as VBA functions (which is time consuming), or solved using the evaluate function (which … Continue reading →

Posted in Excel, VBA | Tagged , , | 1 Comment