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Category Archives: Newton
mpmath for Excel
mpmath has been mentioned in passing here before, but not in any detail. The mpmath site says: mpmath is a free (BSD licensed) Python library for real and complex floating-point arithmetic with arbitrary precision. It has been developed by Fredrik … Continue reading
Posted in Excel, Link to Python, Maths, PyXLL, UDFs, VBA, xlwings
Tagged evaluate pi, Excel, high precision maths, mpmath, Python, PyXLL, UDFs, VBA, xlwings
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More updates to ArcSpline and IP2
I have uploaded version 2.18 of the IP2 spreadsheet to: IP2.zip The new version includes updates to the IP, IP_4, and ArcSpline functions, as described below. The download is free and includes full open-source code. The IP and IP_4 functions find … Continue reading
Posted in Arrays, Coordinate Geometry, Excel, Maths, Newton, UDFs, VBA
Tagged arcspline, Array function entry, Automatic re-size array functions, Excel, IP2.xlsb, Line intersections, UDFs, VBA
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More SciPy Solvers
The xlwings Scipy spreadsheet has been updated with a new example of the xl_SolveF function, that uses the Scipy Optimize root function. The new spreadsheet can be downloaded from: xlScipy3.zip The new example uses a python function ic_calc (included in the … Continue reading
Posted in Excel, Link to Python, Newton, NumPy and SciPy, UDFs, VBA, xlwings
Tagged bolt group, Excel, Python, SciPy, solvers, UDFs, VBA, xlwings
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Python Problems
I have recently returned to using Pyxll to link Excel to Python (of which more later), which required the installation of a 32 bit version of Python 3.7. First trials after installation returned the message: “AttributeError: ‘module’ object has no … Continue reading
Posted in Computing - general, Link to Python, NumPy and SciPy
Tagged CLSIDToPackageMap, installation, Python, py_gen
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Numerical Integration; Tanh-Sinh Quadrature v. 4.4
Update 27 Nov 2018: Version 4.41 now available from the link below, with minor modifications for compatibility with Excel 2007. I recently received a new version (4.4) of the numerical integration spreadsheet by Graeme Dennes which is now available for … Continue reading
Posted in Charts, Excel, Maths, Newton, Numerical integration, UDFs, VBA
Tagged Double Exponential, Excel, Gauss-Kronrod, numerical integration, Romberg, Tanh-Sinh method, Tanh-Sinh Quadrature, UDF, VBA
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AS 3600 and RC Design Functions 8.01
The updated RC Design Functions spreadsheet (presented here) included an updated UMom function to find the ultimate strength of a rectangular section under combined bending and axial load; but I omitted to include the revisions to the alpha2 and Gamma … Continue reading
Posted in Beam Bending, Concrete, Excel, Newton, UDFs, VBA
Tagged AS 3600, Excel, Rectangular stress block factors, Reinforced Concrete Design Functions, UDF, ULS design, VBA
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Falling feathers and hammers
It is well known that at the end of the Apollo 15 Moon landing, Commander David Scott dropped a hammer and a feather to demonstrate that they would accelerate at the same rate, and land on the ground together: What is … Continue reading
