Tag Archives: Interpolation

Scipy Functions with Excel and pyxll 2 – Interpolation

Posted on 13/12/2023 by dougaj4

Following the previous post I will now look in more detail at the functions in the py_Interpolate spreadsheet included in the download file: py_SciPy.zip Details of the required pyxll package (including download, free trial, and full documentation) can be found … Continue reading →

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

VBA procedures for the Numerical Analysis of Tabular Functions

Posted on 12/03/2022 by dougaj4

Long time on-line friend Alfred Vachris has recently been converting Fortran code developed through his working career into VBA: I had the opportunity to work at Grumman while going to Graduate School and they gave me a part-time job as … Continue reading →

Posted in Coordinate Geometry, Curve fitting, Excel, Fortran, Maths, Newton, UDFs, VBA | Tagged , , , , , , | 1 Comment

Daily Download 22: Splines and Curves

Posted on 08/10/2012 by dougaj4

Since it was first published in 2009 my CSpline function has been the most popular download from this site.  CSpline (and various associated functions) is used to fit a series of cubic curves through specified points, allowing interpolation along a smooth … Continue reading →

Posted in AlgLib, Beam Bending, Charts, Charts, Coordinate Geometry, Excel, Newton, Numerical integration, UDFs, VBA | Tagged , , , , , , , , | 7 Comments

Spline Interpolation Alternatives

Posted on 04/09/2011 by dougaj4

A recent post at Jon Peltier’s Blog looks at an “on-sheet” method of performing linear interpolation on a set of tabular data, and the following comments include a number of alternative ways of carrying out the same process, and also some … Continue reading →

Posted in Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , | 7 Comments

Interpolation Update

Posted on 07/12/2010 by dougaj4

The interpolation functions in IP2.xls have been given an overhaul: The linear and quadratic interpolations routines have been modified to accept negative values. All the routines have been modified to convert the table range to an array, rather than using a … Continue reading →

Posted in Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , | 4 Comments