Author Archives: dougaj4

Transfer of arrays to/from Python with Pyxll – Part1; Data Types

Posted on 16/03/2014 by dougaj4

This post will look at options for transferring arrays between Excel and Python using Pyxll, including data types, and problems associated with transferring mixed data types.  In the following post I will look at the relative performance of the various … Continue reading →

Posted in Arrays, Excel, Link to Python, VBA | Tagged , , , , | 2 Comments

More from the little unsaid

Posted on 09/03/2014 by dougaj4

First Real Steps (whilst floating down a London canal tunnel) On the making of his new album (and living in London) and crowd funding through Pledgemusic: http://www.pledgemusic.com/projects/thelittleunsaid

Posted in Bach | Tagged , , | Leave a comment

Problems with UCase and LCase in VBA

Posted on 08/03/2014 by dougaj4

A recent comment reported a problem with the use of the UCase and LCase (upper and lower case) functions in VBA.  The function was returning the error message “Compile error: Can’t find project or library”. I found the same problem … Continue reading →

Posted in Excel, Link to dll, VBA | Tagged , , , , , , | 6 Comments

Global to Local for plates (and three node beams)

Posted on 02/03/2014 by dougaj4

The Glob_to_Loc function (see Converting from global to local coordinates (and vice versa) ) converts forces and deflections of a beam from the global coordinate system to the local system, defined by the longitudinal axis of the beam and a rotation angle … Continue reading →

Posted in Coordinate Geometry, Excel, Finite Element Analysis, Frame Analysis, Link to Python, Maths, Newton, Strand7, UDFs, VBA | Tagged , , , , , , , | 3 Comments

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