Tag Archives: Python

Units and solvers with Pint and Sympy

Posted on 29/07/2018 by dougaj4

Following the previous post I have adapted the units code to use the Pint package, and added a function using the Sympy equation solver, with Pint units.  I have applied the functions to finding the depth of neutral axis of a … Continue reading →

Posted in Beam Bending, Concrete, Excel, Link to Python, Maths, Newton, UDFs, VBA, xlwings | Tagged , , , , , , , , , , , | 1 Comment

Working with units in Excel – using VBA and Python

Posted on 15/07/2018 by dougaj4

One of the most frequent reasons given for not using Excel for engineering and scientific applications is its very limited  facilities for dealing with calculations involving units.  It is possible to overcome this deficiency with VBA (see  Daily Download 24: … Continue reading →

Posted in Excel, Link to Python, Maths, Newton, NumPy and SciPy, UDFs, VBA, xlwings | Tagged , , , , , , , | 9 Comments

Scipy Statistics Functions – coding and getting help

Posted on 10/07/2018 by dougaj4

The Python Scipy library currently has 84 statistics functions.  I have now updated the xlwSciPy3 spreadsheet to access all of them directly from Excel.  The new version can be downloaded from: xlwSciPy3.zip As usual, the download includes full open-source code.  … Continue reading →

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

Passing variable argument lists from Excel to Python via xlwings

Posted on 08/06/2018 by dougaj4

When calling a Python function it is sometimes necessary to pass a variable number of arguments.  Examples from the xlw_Scipy spreadsheet include: Curve fitting functions, for which the functions to be fitted may have any number of arguments. The Scipy … Continue reading →

Posted in Arrays, Excel, Link to Python, NumPy and SciPy, UDFs, VBA, xlwings | Tagged , , , , , , , , | 2 Comments

Returning Arrays From VBA and Python

Posted on 01/06/2018 by dougaj4

Most  of the  user defined functions (UDFs) presented on this blog return a multi-cell array, that must be entered by selecting the output range then pressing Ctrl-shift-enter to display all the results.  This process has several inconveniencies: You need to know … Continue reading →

Posted in Arrays, Excel, Link to Python, UDFs, VBA, xlwings | Tagged , , , , , , , | 1 Comment