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# Tag Archives: UDF

## Using Excel with Python and ctypes

The Strand7 API provides an interface between the Strand7 Finite Element Analysis program and external software. It works with many different languages, including Python, which uses ctypes to transfer data to and from the API functions. It is essential that … Continue reading

Posted in Beam Bending, Excel, Link to dll, Link to Python, NumPy and SciPy, PyXLL, Strand7, UDFs
Tagged ctypes, Excel, Python, PyXLL, Strand7 API, UDF
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## Spherical Geometry and Vincenty’s Formulae

Wikipedia has detailed articles on: Spherical Geometry and Vincenty’s Formulae (for geometric calculations on an ellipsoid). The spreadsheet Vincenty.xlsb 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 ellipsoid area, ellipsoid distance, Excel, Spherical Geometry, UDF, VBA, Vincenty's Formulae
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## Concrete Stress Blocks

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

## Section Properties for Rotated Shapes

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 Excel, section properties, section properties of rotated shapes, UDF, VBA
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## New sort functions and sorting to groups

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 Excel, GroupSort Function, Sort Function, Sortby Function, UDF, VBA
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