Tag Archives: Cubic splines

Cubic splines with jagged data

Posted on February 7, 2018 by dougaj4

A cubic spline provides a good approximation to a smooth curve, and alternative versions are available for free download (see Daily Download 22: Splines and Curves, Update to AL-Spline-Matrix, and xlwSciPy 1.09 – update for xlwings 0.10 and Scipy 0.18.1), but if … Continue reading →

Posted in Arrays, Beam Bending, Concrete, Curve fitting, Excel, Newton, UDFs, VBA | Tagged , , , , , , | 2 Comments

xlwSciPy 1.09 – update for xlwings 0.10 and Scipy 0.18.1

Posted on October 2, 2016 by dougaj4

The xlwSciPy spreadsheet (last presented here) has been updated for the latest version of xlwings and Scipy. The new spreadsheet can be downloaded from: xlScipy-xlw.zip including full open source code. The spreadsheet requires Python, including xlwings, Numpy, Scipy and Pandas … Continue reading →

Posted in Arrays, Curve fitting, Excel, Link to Python, Maths, NumPy and SciPy, Python Pandas, UDFs, VBA | Tagged , , , , , , , , | 2 Comments

xlScipy with xlwings

Posted on March 20, 2016 by dougaj4

Following a new release of xlwings, I have updated the xlScipy spreadsheet to work with it, and added a few new features: The Matplotlib routines to plot a function entered as text (previously posted as xlMatPlot.zip) have been incorporated on … Continue reading →

Posted in Excel, Link to Python, Maths, Newton, NumPy and SciPy, UDFs, VBA | Tagged , , , , , , , , | Leave a comment

Cubic splines with descending x

Posted on March 1, 2016 by dougaj4

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 →

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Alglib/Python spline functions

Posted on July 25, 2014 by dougaj4

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 , , , , , , , , , , , | 1 Comment