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Author Archives: dougaj4
Using the AlgLib ODE (Runge-Kutta) Solver with Excel
Or to be more correct, the AlgLib Cash-Karp Solver, Cash-Karp being a refinement of the Runge-Kutta method of solving ordinary differential equations. Solution of differential equations is an iterative process requiring the repeated application of the solver routine followed by evaluation of … Continue reading
Posted in AlgLib, Beam Bending, Differential Equations, Excel, Maths, Newton, UDFs, VBA
Tagged AlgLib, buckling, Cash-Karp, differential equations, Excel. VBA, hole through the middle of the earth, Runge-Kutta, SHM, UDF
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Elegant solutions, Simple Harmonic Motion, and the hole through the middle of the Earth
No, not the hole (beloved of conspiracy theorists everywhere) where our alien overlords keep their UFO’s, but rather the equally imaginary hole from Pole to Pole (beloved of physics teachers everywhere) where we can drop in objects and watch them travel … Continue reading
Find dead links
When useful sites close, leading to dead links, try: http://www.archive.org where web sites are archived on a regular basis. You will need the exact web address, there is no text search, but if you have it there is a good … Continue reading
Xll add-ins; are they worth the trouble?
As regular readers will know, I occasionally delve into compiling code in C++, or even Fortran, as dlls and link to them with a short piece of VBA to communicate between the spreadsheet and the compiled code. I have also … Continue reading
AlgLib Spline Functions
Following earlier posts on cubic splines I have collected the Alglib interpolation routines, and the necessary supporting routines, and written interface functions to allow most of the 1Dspline routines to be called from the spreadsheet. Since there is a large measure … Continue reading
Posted in Excel, Maths, Newton, UDFs, VBA
Tagged Akima Spline, AlgLib, Catmull-Rom Spline, Cubic spline, Excel, Hermite Spline, Least Squares fit, Spline, Spline Integration, UDF, VBA
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