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# Category Archives: Maths

## A not so easy problem

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

## Latex Maths Text in Excel

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 EvalU, Excel, Latex, Math Text, mpmath, Pint, Python, PyXLL, Sympy, UDFs, Unit-aware calculation
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## Calling Numpy polynomial functions from Excel

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 Excel, Link to Python, Numpy, PyXLL, UDFs
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## Solving cubic equations – background and timing

For more information on the polynomial functions, including quartic and higher order solvers, see: Solving Quadratic, Cubic, Quartic and higher order equations; examples Re-reading the Wikipedia article on solving cubic equations, I noticed that the trigonometrical solution for finding 3 real … Continue reading

Posted in Excel, Link to Python, Maths, Newton, NumPy and SciPy, PyXLL, UDFs, VBA
Tagged cubic equations, Excel, Numba, Numpy, Polynomials, Pyhon, PyXLL, Quartic equations, UDFs, VBA
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## Installing Python and pyxll from scratch

Updated 28th September 2022. Matplotlib latest version OK. I recently installed Python and pyxll (plus the required additional libraries) on a new computer, which raised a few problems with incompatible versions, so here is a summary of what worked (as … Continue reading

Posted in Animation, Arrays, Charts, Coordinate Geometry, Differential Equations, Excel, Finite Element Analysis, Link to Python, Maths, Newton, Numerical integration, NumPy and SciPy, Python Pandas, PyXLL, UDFs
Tagged Excel, installation, kaleido, MatPlotlib, mpmath, Numba, Numpy, Pint, plotly, PyPardiso, Python, PyXLL, SciPy, sectionproperties, Sympy
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