Category Archives: Maths

Using VBA Evaluate as an Array Function

Posted on 24/08/2018 by dougaj4

I recently discovered from a thread at  Chandoo’s Excel Forum that the VBA Evaluate function can be used as an array function.  As a simple example: Range(“A11:A16”).Value = Evaluate(“= B11:B16 + C11:C16”) will add the values in columns B and C, … Continue reading →

Posted in Arrays, Coordinate Geometry, Excel, Maths, UDFs, VBA | Tagged , , , , | 2 Comments

Arcs and arc-splines

Posted on 17/08/2018 by dougaj4

I have added two user defined functions (UDFs) to the IP2 spreadsheet to generate coordinates for a single  arc, or a series of arcs connected (if necessary) by straight lines.  The new version may be downloaded from: IP2.zip As an example … Continue reading →

Posted in Animation, Charts, Charts, Coordinate Geometry, Drawing, Excel, Maths, UDFs, VBA | Tagged , , , , , , | 1 Comment

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