Category Archives: AlgLib

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 →

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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 →

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Evaluating text and Integration with Python and ALGLIB

Posted on 07/07/2014 by dougaj4

Following the previous post on evaluating mathematical functions entered as text on the spreadsheet, I have now written a spreadsheet with similar functionality using Python functions, and the Excel-Python add-in.  Also included are integration functions using the SciPy Python library, … Continue reading →

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

Evaluating text – update

Posted on 28/06/2014 by dougaj4

One disadvantage of the spreadsheet style interface is that even simple formulae are difficult to check.  For instance, the deflection of a cantilever loaded at the end is given by: F*L^3/(3*E*I) which is much easier to read than the Excel … Continue reading →

Posted in AlgLib, Excel, Maths, Newton, Numerical integration, UDFs, VBA | Tagged , , , , , , , | 5 Comments