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# Author Archives: dougaj4

## 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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## Working with Python polynomials from Excel

Python polynomial functions have several features that require manipulation of data passed from Excel: I have written 3 short Python functions to deal with passing arrays of complex numbers from and to Excel, using pyxll, or within Python code to … Continue reading

Posted in Arrays, Excel, Link to Python, PyXLL, UDFs
Tagged complex numbers, Complex to real, Excel, Numpy, Polynomials, Python, PyXLL, Real to complex, Reversing arrays, UDFs
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## A Match Function Bug …

… or at least, a non-intuitive feature of the MATCH function, that may give inconsistent results. This post is based on a discussion at EngTips. The problem under discussion was to find the number of the first and last rows … Continue reading

## 3D plots with the latest Matplotlib

Installing Python on a new computer, I found I had to downgrade Matplotlib to release 3.5.2 to get my 3D plotting functions to work. Further investigation found that the problem was the Axes3D function. Changing: ax = axes3d.Axes3D(fig)to: … Continue reading

Posted in Animation, Coordinate Geometry, Drawing, Excel, Link to Python, Newton, NumPy and SciPy, PyXLL, UDFs
Tagged Excel, MatPlotlib, Plot 3D images, Python, PyXLL, Rotate 3D images, UDFs
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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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