Category Archives: Newton

Stepping through 3DFrame

Posted on 16/09/2017 by dougaj4

Following a recent comment this post looks at the code for setting up the stiffness matrix for a 3D frame, and how to step through any selected part of the code. The general procedure for setting up a 3D stiffness matrix, … Continue reading →

Posted in Beam Bending, Excel, Finite Element Analysis, Frame Analysis, Newton, UDFs, VBA | Tagged , , , , , | Leave a comment

Setting up UDF Applications

Posted on 09/09/2017 by dougaj4

Following a recent comment, this post looks at setting up a user defined function (UDF) on a blank worksheet, using the ConBeamU function as an example. To use a UDF, the VBA code for the function must either be included … Continue reading →

Posted in Arrays, Beam Bending, Excel, Finite Element Analysis, Newton, UDFs, VBA | Tagged , , , , | 2 Comments

Evaluating text and calling Python functions from Excel with xlwings

Posted on 23/08/2017 by dougaj4

The Alglib spreadsheet presented here includes functions to evaluate formulas entered as text on the spreadsheet, or to call specified Python functions.  I have now added a user defined function (UDF) that will perform either of these operations (xl_CallFuncD), and added … Continue reading →

Posted in AlgLib, Excel, Link to Python, Maths, Newton, NumPy and SciPy, UDFs, VBA, xlwings | Tagged , , , , , , , , , | 1 Comment

Excel to Alglib via xlwings

Posted on 11/08/2017 by dougaj4

The Alglib library provides many valuable numerical analysis routines, but the VBA version is no longer actively maintained.  The latest versions are available in C++, C#, and Python, of which the Python version (in conjunction with xlwings) provides the easiest interface … Continue reading →

Posted in AlgLib, Curve fitting, Excel, Link to Python, Maths, Newton, Numerical integration, UDFs, VBA, xlwings | Tagged , , , , , , , , , | 12 Comments

Using the Frame Analysis Spreadsheets

Posted on 20/07/2017 by dougaj4

Following some recent questions in the comments, here are some answers: How can nodal moments be created? The current versions only allow for forces to be applied to beams, but any point load or moment applied at the start or … Continue reading →

Posted in Excel, Finite Element Analysis, Frame Analysis, Newton, VBA | Tagged , , , , | 2 Comments