Category Archives: NumPy and SciPy

Transfer of arrays to/from Python with Pyxll – Part 2; Speed

Posted on 22/03/2014 by dougaj4

Following the previous post, which looked at the way different data types worked when transferring data between Excel and Python, this post looks at ways t0 get the best performance. As a benchmark I have used a short routine that: … Continue reading →

Posted in Arrays, Excel, Link to Python, NumPy and SciPy, VBA | Tagged , , , , , , | 1 Comment

The angle between two vectors, Python version

Posted on 01/03/2014 by dougaj4

I posted a VBA function to return The angle between two vectors, in 2D or 3D last year, and have just discovered that Python and Numpy are lacking this function.  Since all the suggested code I found in a quick search used: Cos θ … Continue reading →

Posted in Coordinate Geometry, Excel, Link to Python, Maths, Newton, NumPy and SciPy | Tagged , , , | 10 Comments

New Links: Scientific Python and Engineering Excel

Posted on 31/01/2014 by dougaj4

The previous post had a link to Cyrille Rossant which is worth a closer look.  The blog has many detailed posts on scientific applications of Python, as well as links to Galry: a high performance interactive visualization package in Python and his … Continue reading →

Posted in Excel, Link to Python, Newton, NumPy and SciPy, VBA | Tagged , , , , | Leave a comment

The speed of loops in Python

Posted on 24/01/2014 by dougaj4

This post is based on exercises published by Cyrille Rossant in his book “Learning IPython for Interactive Computing and Data Visualization”.  Cyril also has a blog well worth looking at: http://cyrille.rossant.net/blog/ (Thanks to Alfred Vachris and Boris Vishnevsky for the links). … Continue reading →

Posted in Arrays, Link to Python, NumPy and SciPy | Tagged , , , , | Leave a comment

Python for VBA users- 7; Making Python go Faster

Posted on 20/12/2013 by dougaj4

As reported in the previous post in this series, although the compiled routines included in packages such as Numpy, Scipy, and Pysparse are very fast, other parts of the code turned out to be slower than the equivalent in VBA.  … Continue reading →

Posted in Arrays, Excel, Finite Element Analysis, Frame Analysis, Link to Python, Newton, NumPy and SciPy, UDFs, VBA | Tagged , , , , , | Leave a comment