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Category Archives: UDFs
AlgLib Complex Number Functions
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 AlgLib, complex numbers, Excel, math functions, UDF, VBA
2 Comments
Solving cubic and quartic equations with Excel
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
The hole through the middle of the Earth – moved to the Equator
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 Excel, hole trough the middle of the Earth, ODE Function, ODE solver, UDF, VBA
2 Comments
Lateral pile analyis with PY curves …
… and non-linear pile properties. In previous posts I have presented Excel User Defined Functions (UDFs) to analyse a laterally loaded pile, generate soil PY Curves based on the recommendations in the COM624 Manual, and determine the flexural stiffness of cracked … Continue reading
Posted in Concrete, Excel, Geotechnical Engineering, Newton, UDFs, VBA
Tagged COM624, Excel, Laterally loaded pile, Non-linear concrete, UDF, VBA
17 Comments
The hole through the middle of the Earth – revised transit time
In the previous post in this series I produced a table of acceleration due to gravity against depth from surface, based on the four layers of the Earth (Crust, Mantle, Outer Core, Inner Core), assuming a constant density for each layer. … Continue reading
Posted in Differential Equations, Excel, Newton, UDFs, VBA
Tagged Excel, hole through the middle of the earth, ODE Function, UDF, VBA
3 Comments
