Category Archives: Newton

Evaluating text – update

Posted on 28/06/2014 by dougaj4

One disadvantage of the spreadsheet style interface is that even simple formulae are difficult to check.  For instance, the deflection of a cantilever loaded at the end is given by: F*L^3/(3*E*I) which is much easier to read than the Excel … Continue reading →

Posted in AlgLib, Excel, Maths, Newton, Numerical integration, UDFs, VBA | Tagged , , , , , , , | 5 Comments

Reinforced Concrete – ULS capacity under combined axial load and biaxial bending

Posted on 19/06/2014 by dougaj4

I have modified the ULS Design Functions spreadsheet, last presented here, to analyse sections subject to bi-axial bending, and non-symmetrical sections.  The new version makes use of the routines for splitting any section defined by XY coordinates into trapezoidal layers, described … Continue reading →

Posted in Beam Bending, Concrete, Excel, Newton, UDFs, VBA | Tagged , , , , , , | 13 Comments

Data Transfer to Python – Update

Posted on 08/06/2014 by dougaj4

As noted in the comments here, the main bottleneck in the Python matrix solver functions presented recently was not in the data transfer from Excel, but rather in the creation of the Numpy arrays for very long lists of short … Continue reading →

Posted in Arrays, Excel, Frame Analysis, Link to Python, NumPy and SciPy, VBA | Tagged , , , , , | 4 Comments

Feet and inches, and other units

Posted on 31/05/2014 by dougaj4

Following a query at Eng-tips I have had a look at options in Excel for converting metres to feet and inches, with the inches displayed as a fraction rather than a decimal. Converting from metres to feet or inches is … Continue reading →

Posted in Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , | 1 Comment

Python Matrix Functions with ExcelPython – 2

Posted on 28/05/2014 by dougaj4

Following the previous ExcelPython post I have modified the VBA and Python code for improved performance and to simplify the Python coding.  The main change is that where Numpy Arrays are required in the Python code, these are now created … Continue reading →

Posted in Arrays, Excel, Link to Python, Maths, NumPy and SciPy, UDFs, VBA | Tagged , , , , , , | 14 Comments