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Tag Archives: VBA
Cubic splines with descending x
In response to a recent comment, I have modified the CSpline2 spreadsheet so that the CSplineA and CHSplineA functions will accept x values list in descending order, as well as ascending. For more details of the background to the functions, … Continue reading
Posted in Excel, Maths, Newton, UDFs, VBA
Tagged Cubic splines, descending x, Excel, UDF, VBA
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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
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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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Tanh-Sinh Quadrature via F2PY
Fast and accurate numerical integration routines based on the Tanh-Sinh method are available as Excel VBA based functions in the Tanh_Sinh Quadrature spreadsheet by Graeme Dennes. Graeme’s VBA code is based on open source Fortran code by Takuya Ooura, which … Continue reading
Posted in Excel, Fortran, 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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xlSciPy – Python SciPy for Excel; Update with new functions
The xlSciPy spreadsheet, previously described here, has been updated with new functions for integration, finding equation roots and maxima and minima, solving systems of non-linear equations, and evaluation of equations entered as text. The new version (including full open-source VBA … Continue reading
Posted in Excel, Link to Python, Maths, Newton, Numerical integration, NumPy and SciPy, UDFs, VBA
Tagged Excel, ExcelPython, Integration, minimization, Python, root finding, SciPy, SciPy.optimize, solvers, UDF, VBA
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