Category Archives: VBA

The Inverse Quadratic Method 3 – Brent’s Method

Posted on 13/04/2010 by dougaj4

The previous post in this series presented iterative methods to solve polynomial equations using direct or inverse quadratic interpolation.  These methods have two disadvantages: In some circumstances the function may converge very slowly, or not at all. The name of … Continue reading →

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

Calling a function as a variable

Posted on 08/04/2010 by dougaj4

The functions described in recent posts provide iterative solutions to polynomial equations, but the same method can be used for any equations that can be evaluated numerically and have a single variable.  The question then is, how can we call a … Continue reading →

Posted in Arrays, Excel, Maths, UDFs, VBA | Tagged , , , , , , | 6 Comments

The Inverse Quadratic Method – 2

Posted on 04/04/2010 by dougaj4

Firstly a clarification from the previous post in this series.  The method presented in that post was a direct application of quadratic interpolation, rather than the inverse quadratic method, as implied by the post title.  The inverse quadratic method will be … Continue reading →

Posted in Excel, Maths, UDFs, VBA | Tagged , , , , | 3 Comments

Some VBA maths resources

Posted on 01/04/2010 by dougaj4

In the past week I have discovered a couple of  sites with open source maths related VBA code that I was previously unaware of, and which deserve to be better known: AlgLib: “ALGLIB is a cross-platform numerical analysis and data processing library. … Continue reading →

Posted in Arrays, Excel, Maths, VBA | Tagged , , | 4 Comments

Function roots with the Inverse Quadratic Method

Posted on 31/03/2010 by dougaj4

An earlier post presented various methods for finding the roots of polynomial functions based on the use of linear interpolation.  It is sometimes advantageous to use a quadratic interpolation function, and methods using this approach will be presented in this and following … Continue reading →

Posted in Excel, Maths, UDFs, VBA | Tagged , , , , | 5 Comments