Category Archives: UDFs

3D Frames, axes and stiffness matrices

Posted on 09/12/2016 by dougaj4

In the course of adding provision for spring end releases to the 3DFrame spreadsheet, I have also tidied up the code for generating the structure stiffness matrix, and added some documentation to the spreadsheet.  The revised spreadsheet (version 2.02) can … Continue reading →

Posted in Arrays, Beam Bending, Excel, Finite Element Analysis, Frame Analysis, Newton, Strand7, UDFs, VBA | Tagged , , , , , , , , | 10 Comments

Nearest Lookup Function

Posted on 21/10/2016 by dougaj4

The Excel Lookup functions (including VLookup, HLookup and Match) all allow for an “exact” or “closest” match on numerical data, but the closest option has a number of problems: The data must be sorted For VLookup and HLookup the data … Continue reading →

Posted in Coordinate Geometry, Excel, Maths, UDFs, VBA | Tagged , , , , , , , , | 2 Comments

xlwSciPy 1.09 – update for xlwings 0.10 and Scipy 0.18.1

Posted on 02/10/2016 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

VBA routines for splitting and joining text

Posted on 25/09/2016 by dougaj4

As mentioned in the previous post, I have written two short VBA routines to aid the process of splitting a column of text strings into separate columns, using either a space or any other chosen character as the delimiter.  These … Continue reading →

Posted in Excel, UDFs, VBA | Tagged , , , , , , , | Leave a comment

Non-linear Frame Analysis – Scipy solvers

Posted on 11/09/2016 by dougaj4

The frame analysis spreadsheet presented in the previous post has been updated to use the solvers included in the Scipy package.  There is now an option to use either the Cholesky solver, or an iterative sparse solver.  The main advantages of … Continue reading →

Posted in Arrays, Beam Bending, Excel, Finite Element Analysis, Fortran, Frame Analysis, Link to dll, Link to Python, Newton, NumPy and SciPy, Strand7, UDFs, VBA | Tagged , , , , , , , , , , , , , | 1 Comment