Category Archives: Maths

xlwings – dataframes and statistics

Posted on 12/04/2016 by dougaj4

Another data conversion option offered by the latest xlwings release is Pandas dataframes and dataseries.  This post will look at how to pass an Excel range as a dataframe or dataseries in a User Defined Function (UDF), and some simple … Continue reading →

Posted in Excel, Link to Python, Maths, Newton, Python Pandas, UDFs, VBA | Tagged , , , , , , , | 4 Comments

xlwings 0.7.1, dictionaries, and optional arguments

Posted on 08/04/2016 by dougaj4

xlwings 0.7.0 was published at the beginning of March, and introduced direct support for Python dictionaries, which I have used to demonstrate various options for dealing with optional arguments in Excel User Defined Functions (UDFs).  The latest version, 0.7.1, published … Continue reading →

Posted in Curve fitting, Excel, Link to Python, Maths, NumPy and SciPy, UDFs, VBA | Tagged , , , , , , , , | 1 Comment

xlScipy with xlwings

Posted on 20/03/2016 by dougaj4

Following a new release of xlwings, I have updated the xlScipy spreadsheet to work with it, and added a few new features: The Matplotlib routines to plot a function entered as text (previously posted as xlMatPlot.zip) have been incorporated on … Continue reading →

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

Cubic splines with descending x

Posted on 01/03/2016 by dougaj4

In response to a recent comment, I have modified the CSpline2 spreadsheet so that the CSplineA and CHSplineA functions will accept x values list in descending order, as well as ascending.  For more details of the background to the functions, … Continue reading →

Posted in Excel, Maths, Newton, UDFs, VBA | Tagged , , , , | Leave a comment

Spreadsheets all the way down

Posted on 22/02/2016 by dougaj4

If you need another reason to attend Excel Summit South, watch this video, and discover that mobile phones are spreadsheets all the way down.    

Posted in Excel, Maths, Newton | Tagged , , | Leave a comment