Category Archives: Arrays

Continuous beam with specified end conditions …

Posted on 09/08/2009 by dougaj4

… and/or support displacements. The previous post in this series derived cubic splines with specified end conditions; either a specified curvature or a specified end slope. I have adapted the splinebeam function to allow input of specified end conditions (either a … Continue reading →

Posted in Arrays, Beam Bending, Excel, Finite Element Analysis, Frame Analysis, Maths, Newton, UDFs, VBA | Tagged , , , , , , , | 1 Comment

Continuous beam analysis with cubic splines

Posted on 05/07/2009 by dougaj4

The last example in the previous post illustrated the use of cubic splines to find the bending moments in a continuous beam subject to prescribed lateral displacements.  A similar technique can be used to find bending moments, shear forces, reactions, … Continue reading →

Posted in Arrays, Beam Bending, Excel, Finite Element Analysis, Frame Analysis, Maths, Newton, UDFs, VBA | Tagged , , , , , , , | 9 Comments

Finding square roots …

Posted on 06/05/2009 by dougaj4

… to 100 decimal places. Why would anyone want to do that? To solve Project Euler Problem 80: “It is well known that if the square root of a natural number is not an integer, then it is irrational. The … Continue reading →

Posted in Arrays, Excel, Maths, Newton, UDFs, VBA | 2 Comments

Moving Average Function

Posted on 04/05/2009 by dougaj4

The previous post presented a simple moving average user defined function (UDF).  This has been extended to provide additional functionality: A weighted average may be returned; either a linear weight with a specified step value, or a using any specified weighting … Continue reading →

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

Moving averages and User Defined Array Functions

Posted on 25/04/2009 by dougaj4

I have recently needed to work with moving averages on a large-ish data set (about 10,000 rows x 10 columns), and for reasons that I will describe in the next post, decided that a User Defined Function (UDF) would be … Continue reading →

Posted in Arrays, Excel, UDFs, VBA | Tagged , , , , | 8 Comments