Tag Archives: UDF

Two MaxAbs functions

Posted on 20/01/2014 by dougaj4

Excel does not have a built-in function to find the maximum absolute value of a range, perhaps because the Max() and Abs() functions can be combined in an array function: =Max(Abs(datarange)) This solution has a number of drawbacks however: The … Continue reading →

Posted in Arrays, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , | 9 Comments

Solving Quadratic, Cubic, Quartic and higher order equations; examples

Posted on 14/01/2014 by dougaj4

A previous post presented a spreadsheet with functions for solving cubic and quartic equations, and this has been extended with another function solving higher order polynomials.  The functions are actually very easy to use, but the documentation in the spreadsheets is quite brief, … Continue reading →

Posted in Arrays, Excel, Link to Python, Maths, Newton, UDFs, VBA | Tagged , , , , , , , , , | 13 Comments

Converting from global to local coordinates (and vice versa)

Posted on 08/01/2014 by dougaj4

In 3D structural analysis (as well as many other applications) it is necessary to convert section properties, forces, and deflections between coordinate systems defined by individual structural members (local coordinates) and the common coordinate system defining the entire structure (global … Continue reading →

Posted in Excel, Finite Element Analysis, Frame Analysis, Link to Python, Maths, UDFs, VBA | Tagged , , , , , , , | 22 Comments

Download update – Python downloads

Posted on 08/12/2013 by dougaj4

Download files related to linking to Python from Excel are to be found in: Python matrix functions in Excel, using Pyxll: Download file: http://interactiveds.com.au/software/Matrixpyxll.zip Python for VBA users – 4; Python data types:  The main Python data types, including numpy arrays, with examples … Continue reading →

Posted in Excel, Link to Python, UDFs, VBA | Tagged , , , , , | Leave a comment

Extracting numbers from text strings

Posted on 07/12/2013 by dougaj4

There is often a need to extract numbers from the start or end of text strings.  It’s not too hard to do with on-sheet formulas, but after having done it a few thousand times I decided it would be worth … Continue reading →

Posted in Excel, UDFs, VBA | Tagged , , , , , , | 13 Comments