Category Archives: Excel

LU Decomposition with Python and Scipy

Posted on 26/05/2023 by dougaj4

This post was prompted by a question at the Eng-Tips forum: LU Decomposition which asked why Mathcad was generating LU matrices different to those calculated from the basic theory. The short answer was that there is more than one way … Continue reading →

Posted in Excel, Finite Element Analysis, Link to Python, Maths, Newton, NumPy and SciPy, PyXLL, UDFs | Tagged , , , , , | 2 Comments

py_Numpy update and using Numba

Posted on 11/05/2023 by dougaj4

The py_Numpy spreadsheet presented at Calling Numpy polynomial functions from Excel has had a minor upgrade to the py_Polyfit function, which was previously returning an error message if the optional “full” argument was set to False. The new version can be … Continue reading →

Posted in Curve fitting, Excel, Link to Python, Newton, NumPy and SciPy, PyXLL, UDFs | Tagged , , , , , , | Leave a comment

Two views on VBA

Posted on 28/04/2023 by dougaj4

First from Microsoft: Microsoft are continuing their quest to make downloading spreadsheets with macros ever more difficult, and now any downloaded spreadsheet has VBA code disabled by default. Unblocking the code (if you know and trust the source of the … Continue reading →

Posted in Excel, VBA | Tagged , , , | 3 Comments

More long numbers with Python

Posted on 08/04/2023 by dougaj4

In A not so easy problem I looked at using Python with Excel (via pyxll) to work with very long integers, using the MPMath package. For high precision calculations involving decimal values MPMath is required, but for simple operations entirely … Continue reading →

Posted in Excel, Link to Python, Maths, Newton, PyXLL, UDFs | Tagged , , , , , | 1 Comment

ULS Design Functions – Python version

Posted on 02/04/2023 by dougaj4

I have now converted my ULS Design Functions spreadsheet (last presented here) to Python. The new spreadsheet and open source Python code can be downloaded from: py_ULS Design Functions The spreadsheet has the same functionality as the VBA version, providing … Continue reading →

Posted in Beam Bending, Concrete, Excel, Link to Python, Newton, PyXLL, UDFs | Tagged , , , , , , , , , , , , | 3 Comments