Tag Archives: UDF

Spherical Geometry and Vincenty’s Formulae

Posted on 27/09/2020 by dougaj4

Wikipedia has detailed articles on: Spherical Geometry  and Vincenty’s Formulae (for geometric calculations on an ellipsoid). The spreadsheet Vincenty.zip uses those resources to perform the following calculations, using both on-sheet calculations and VBA user-defined functions (UDF’s): Calculation of distance and … Continue reading →

Posted in Computing - general, Coordinate Geometry, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , | 7 Comments

Concrete Stress Blocks

Posted on 15/08/2020 by dougaj4

Back in 2010 and 2011 posts here looked at a comparison of alternative stress blocks in the then new AS 3600, and a procedure for calculating parameters for a rectangular stress block exactly equivalent to the Eurocode 2 parabolic-rectangular stress … Continue reading →

Posted in Beam Bending, Concrete, Excel, Newton | Tagged , , , , , , , , , | 1 Comment

Section Properties for Rotated Shapes

Posted on 06/08/2020 by dougaj4

I have just posted an update to my section properties spreadsheet, last discussed at: Using Section Properties- Group The new version can be downloaded from: Section Properties07-Group.zip The main sheet provides section properties for a wide variety of defined shapes: This … Continue reading →

Posted in Beam Bending, Coordinate Geometry, Excel, Frame Analysis, Maths, Newton, UDFs, VBA | Tagged , , , , | Leave a comment

New sort functions and sorting to groups

Posted on 16/05/2020 by dougaj4

I first posted a user defined function (UDF) to sort spreadsheet or VBA data back in 2009.  Finally Microsoft have caught up, and Excel 365 subscribers now have two built in sort functions available: =SORT(array,[sort_index],[sort_order],[by_col]) =SORTBY(array, by_array1, [sort_order1], [by_array2, sort_order2],…) … Continue reading →

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

More Python Traps

Posted on 30/03/2020 by dougaj4

I recently posted on some Python Traps, focussing on code where changes in the values of sub-routine arguments were not reflected in the calling routines.  The reverse can also be a problem: if an array, a, is passed to a … Continue reading →

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