Category Archives: Maths

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

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

A not so easy problem

Posted on 12/03/2023 by dougaj4

A seemingly simple problem was posted in my Quora feed: or to put it more mathematically, what three positive integers satisfy the equation: It turns out the answer is not so simple. A full and detailed derivation can be found … Continue reading →

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

Latex Maths Text in Excel

Posted on 27/11/2022 by dougaj4

There have been many posts here looking at alternative ways of working with functions entered as text on a spreadsheet, and working with units, most recently here. One drawback with this approach is that text in an Excel cell must … Continue reading →

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

Calling Numpy polynomial functions from Excel

Posted on 31/10/2022 by dougaj4

The Numpy polynomial related function discussed in recent posts can now be downloaded from: py_Numpy.zip The download file includes Python code and a sample spreadsheet. Required installed software is Python, Numba and pyxll to call the code from Excel. Some … Continue reading →

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