I recently noticed that the iterative linear algebra solvers in my pyLinAlgfuncs3.xlsb spreadsheet had stopped working. It turned out that the optional tolerance argument had been renamed ‘rtol’. Changing all the occurrences of the name in the Python code fixed the problem. The revised code and updated spreadsheet can be downloaded from:

py_SciPy.zip

For more details of the included functions, and links to related topics see: Scipy Functions with Excel and pyxll 7 – Linear Algebra.