Author Archives: dougaj4

Using Linest for non-linear curve fitting, examples, hints and warnings

Posted on 28/06/2015 by dougaj4

Since I wrote Using LINEST for non-linear curve fitting in 2011 it has been by far the most popular post on this blog.  This post (in response to a recent question) provides some more detailed guidance on how to apply the function … Continue reading →

Posted in Curve fitting, Excel | Tagged , , , , , , | 3 Comments

Sheila Chandra; This

Posted on 28/06/2015 by dougaj4

Sentence Is True From: “This Sentence Is True” (The Previous Sentence Is False)

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Conbeam – Python version

Posted on 24/06/2015 by dougaj4

I have converted the continuous beam analysis spreadsheet (last presented here) to Python code, linked to Excel VBA User Defined Functions (UDFs) with ExcelPython.  To run the Python version you will need an installed copy of Python, including Numpy and … Continue reading →

Posted in Beam Bending, Excel, Finite Element Analysis, Frame Analysis, Link to Python, Newton, UDFs, VBA | Tagged , , , , , , , | Leave a comment

Dealing with dates 3: opening and saving csv files without data corruption

Posted on 11/06/2015 by dougaj4

This post makes use of a spreadsheet for reading data from text files, including comma separated value (csv) files.  The latest version includes a routine for saving the imported data in csv format.  It can be downloaded (including full open-source … Continue reading →

Posted in Excel, UDFs, VBA | Tagged , , , , , | 4 Comments

Dealing with dates 2: Getting cell data type and format code

Posted on 08/06/2015 by dougaj4

When working with imported data, or data from an opened csv file, it is often important to know the data type that has been used to store the data.  This may not be obvious, for instance in the previous post we … Continue reading →

Posted in Excel, UDFs, VBA | Tagged , , , , , , , | 6 Comments