Author Archives: dougaj4

Faster Biaxial Bending

Posted on 10/08/2014 by dougaj4

The spreadsheet to calculate ultimate moment capacity of a reinforced or prestressed concrete section under combined axial load and biaxial bending, last presented here, has been updated to use the QuadBrent solver, rather than the Excel Goal Seek function, for … Continue reading →

Posted in Beam Bending, Concrete, Excel, Newton, UDFs, VBA | Tagged , , , , , , , , | 1 Comment

Alglib/Python spline functions update

Posted on 02/08/2014 by dougaj4

The Excel Spline-Matrix spreadsheet has now been updated with several new spline interpolation functions.  See Alglib/Python linear and non-linear fitting functions for links to download and install the necessary Excel-Python and Alglib files.  Also required is Python version 2.7 or 2.6. The … Continue reading →

Posted in AlgLib, Arrays, Excel, Link to Python, Maths, Newton, UDFs, VBA | Tagged , , , , , , , , , , | 2 Comments

The Deserter

Posted on 26/07/2014 by dougaj4

The Deserter is a traditional song featured on Fairport Convention’s 1968 album Liege and Lief; it is said to be the favourite track on the album of Sandy Denny, and the producer, Joe Boyd.  The song has a long history, and … Continue reading →

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Alglib/Python spline functions

Posted on 25/07/2014 by dougaj4

Continuing from the previous post, the new xl_Spline-Matrix.zip spreadsheet includes functions for 1D and 2D linear and cubic splines. The basic 1D spline allows  for output of linear splines, or 5 different types of cubic spline, as listed above. Output may … Continue reading →

Posted in AlgLib, Excel, Link to Python, Maths, Newton, Numerical integration, UDFs, VBA | Tagged , , , , , , , , , , , | 1 Comment

Alglib/Python linear and non-linear fitting functions

Posted on 23/07/2014 by dougaj4

I have updated the Alglib spline-matrix spreadsheet to use the latest Alglib release, using the Python version, in conjunction with the Excel-Python add-in. To use the spreadsheet requires: Python ver 2.7 (or 2.6) Excel-Python Alglib with Python interface In addition … Continue reading →

Posted in AlgLib, Excel, Link to Python, Newton, UDFs, VBA | Tagged , , , , , , | 4 Comments