Author Archives: dougaj4

Tanh-Sinh Quadrature via F2PY – Part 2

Posted on 01/02/2016 by dougaj4

Lets look at some details of the coding. The original code (available here) includes routines “intdeini” to generate an array of points and weights of the quadrature formula, and “intde” to carry out the integration of any supplied function “f”. … Continue reading →

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Tanh-Sinh Quadrature via F2PY

Posted on 31/01/2016 by dougaj4

Fast and accurate numerical integration routines based on the Tanh-Sinh method are available as Excel VBA based functions in the Tanh_Sinh Quadrature spreadsheet by Graeme Dennes.  Graeme’s VBA code is based on open source Fortran code by Takuya Ooura, which … Continue reading →

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The Big Short and When the Levee Breaks

Posted on 27/01/2016 by dougaj4

The new film the Big Short features Led Zeppelin’s “When the Levee Breaks” in the closing credits. The story of how the complete song (with 1 minute 30 seconds of intro) came to be included in the film is also … Continue reading →

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Running Fortran from Python with F2PY

Posted on 13/01/2016 by dougaj4

The last post looking at using the Python F2Py package said: It is also necessary to install a Fortran compiler.  After some trial and error I found that the MinGW (Minimalist GNU for Windows) package worked well. Trying some simple examples … Continue reading →

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xlSciPy – Python SciPy for Excel; Update with new functions

Posted on 04/01/2016 by dougaj4

The xlSciPy spreadsheet, previously described here, has been updated with new functions for integration, finding equation roots and maxima and minima, solving systems of non-linear equations, and evaluation of equations entered as text.  The new version (including full open-source VBA … Continue reading →

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