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# Category Archives: Numerical integration

## Using Section Properties- Group

Following a recent comment I have updated the documentation for finding the section properties of groups of shapes in the Section-Properties-Group spreadsheet. The revised file can be downloaded from: Section Properties07-Group.zip The screenshots below illustrate use of the Group function to … Continue reading

## xlwSciPy update for Python 3

The xlwSciPy spreadsheet allows a wide variety of the science and maths functions in the Python Numpy and Scipy libraries to be called directly from Excel. The spreadsheet has now been updated for use with Python 3. The spreadsheet and … Continue reading

Posted in Coordinate Geometry, Differential Equations, Excel, Link to Python, Maths, Newton, Numerical integration, NumPy and SciPy, Python Pandas, UDFs, VBA, xlwings
Tagged Excel, Numpy, Python, SciPy, UDF, VBA, xlwings
1 Comment

## Section Properties with MeshPY, including torsion and warping

I recently discovered robbie van leeuwen’s structural engineering blog, which has an open-source set of Python routines for calculation of section properties, including torsion and warping constants. The program uses the MeshPY Library for generating the finite element meshes required … Continue reading

Posted in Beam Bending, Concrete, Excel, Finite Element Analysis, Frame Analysis, Link to Python, Maths, Newton, Numerical integration, NumPy and SciPy, Strand7, UDFs, VBA, xlwings
Tagged Excel, MatPlotlib, MeshPY, Python, section properties, Torsion, UDF, VBA, Warping
7 Comments

## Excel to Alglib via xlwings

The Alglib library provides many valuable numerical analysis routines, but the VBA version is no longer actively maintained. The latest versions are available in C++, C#, and Python, of which the Python version (in conjunction with xlwings) provides the easiest interface … Continue reading

Posted in AlgLib, Curve fitting, Excel, Link to Python, Maths, Newton, Numerical integration, UDFs, VBA, xlwings
Tagged AlgLib, Cubic Spline functions, curve fitting, Excel, Higher order polynomials, Matrix Functions, Python, UDF, VBA, xlwings
3 Comments

## Use Matplotlib from Excel with xlwings

Xlwings is another free and open source package allowing communication between Excel and Python. It now incorporates ExcelPython, and is included in the Anaconda Python package, so will support my ExcelPython based spreadsheets after installation of xlwings using: conda install … Continue reading

Posted in Drawing, Excel, Link to Python, Maths, Newton, Numerical integration, NumPy and SciPy, VBA
Tagged Excel, ExcelPython, link Excel to Python, MatPlotlib, Python, VBA, xlwings
8 Comments

## Tanh-Sinh Quadrature via F2PY – Part 3

For the last of the current series on combining Fortran, Python and Excel with F2PY and ExcelPython I have updated the xlSciPy spreadsheet to include two other variants of the Tanh-Sinh function: Quad_TSi integrates a non-periodic function over a semi-infinite … Continue reading

## Tanh-Sinh Quadrature via F2PY – Part 2

Lets look at some details of the coding. The original code (available here) includes routines “intdeini” to generate an array of points and weights of the quadrature formula, and “intde” to carry out the integration of any supplied function “f”. … Continue reading

Posted in Excel, Link to dll, Link to Python, Maths, Newton, Numerical integration, NumPy and SciPy, UDFs, VBA
Tagged Excel, Excel-Python, F2Py, numerical integration, Python, SciPy, Tanh-Sinh Quadrature, UDF, VBA
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