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# Category Archives: AlgLib

## ExcelPython2, Alglib and Spline-Matrix Rel 2.03

Following a comment here: ExcelPython2, Alglib and Spline-Matrix update I have updated the VBA and Python code, and added a missing Python module to the download zip file. See the earlier post for details of installation and use, or download the revised files … Continue reading

Posted in AlgLib, Excel, Link to Python, Maths, Newton, Numerical integration, NumPy and SciPy, UDFs, VBA
Tagged AlgLib, Excel, ExcelPython, Python, Spline-Matrix, UDF, VBA
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## ExcelPython2, Alglib and Spline-Matrix update

The ExcelPython add-in, offering easy access to Python code from Excel VBA, has had a major update to Release 2. The new version provides new features and simpler installation, but has some incompatibilities with code written for the previous version, so the … Continue reading

Posted in AlgLib, Excel, Link to Python, Maths, Newton, UDFs, VBA
Tagged AlgLib, curve fitting, Excel, ExcelPython, Matrix Functions, Python, Spline functions, UDF, VBA
4 Comments

## Alglib/Python spline functions update

The Excel Spline-Matrix spreadsheet has now been updated with several new spline interpolation functions. See Alglib/Python linear and non-linear fitting functions for links to download and install the necessary Excel-Python and Alglib files. Also required is Python version 2.7 or 2.6. The … Continue reading

Posted in AlgLib, Arrays, Excel, Link to Python, Maths, Newton, UDFs, VBA
Tagged 3D Spline function, AlgLib, Excel, Excel-Python, Parametric Splines, Python, Radial Basis Functions, Rational Interpolation, Spline functions, UDF, VBA
1 Comment

## Alglib/Python spline functions

Continuing from the previous post, the new xl_Spline-Matrix.zip spreadsheet includes functions for 1D and 2D linear and cubic splines. The basic 1D spline allows for output of linear splines, or 5 different types of cubic spline, as listed above. Output may … Continue reading

Posted in AlgLib, Excel, Link to Python, Maths, Newton, Numerical integration, UDFs, VBA
Tagged 1D splines, 2D splines, AlgLib, Cubic splines, Excel, Excel-Python, Python, spline curve fitting, spline differentiation, Spline Integration, UDF, VBA
1 Comment

## Alglib/Python linear and non-linear fitting functions

I have updated the Alglib spline-matrix spreadsheet to use the latest Alglib release, using the Python version, in conjunction with the Excel-Python add-in. To use the spreadsheet requires: Python ver 2.7 (or 2.6) Excel-Python Alglib with Python interface In addition … Continue reading

Posted in AlgLib, Excel, Link to Python, Newton, UDFs, VBA
Tagged AlgLib, Excel, linear fitting, non-linear fitting, Python, UDF, VBA
4 Comments

## Evaluating text and Integration with Python and ALGLIB

Following the previous post on evaluating mathematical functions entered as text on the spreadsheet, I have now written a spreadsheet with similar functionality using Python functions, and the Excel-Python add-in. Also included are integration functions using the SciPy Python library, … Continue reading

Posted in AlgLib, Arrays, Excel, Link to Python, Maths, Newton, Numerical integration, NumPy and SciPy, UDFs, VBA
Tagged AlgLib, evaluation of text strings, Excel, Integration, Python, SciPy, VBA
1 Comment

## Evaluating text – update

One disadvantage of the spreadsheet style interface is that even simple formulae are difficult to check. For instance, the deflection of a cantilever loaded at the end is given by: F*L^3/(3*E*I) which is much easier to read than the Excel … Continue reading

Posted in AlgLib, Excel, Maths, Newton, Numerical integration, UDFs, VBA
Tagged Eval function, evaluation of text strings, Excel, UDF, Unit conversion, Units, Units aware, VBA
4 Comments