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Author Archives: dougaj4
Elegant proofs 3
At The Math Less Travelled it says: “Did you know that the ratio between the side of any triangle and the sine of the opposite angle is equal to the diameter of the triangle’s circumcircle? I didn’t! I just learned it … Continue reading
Another old bridge, and some newer ones
A further collection of notable bridges from Southern Germany and Austria. Würzburg’s Old Main Bridge (Alte Mainbrücke) was built 1473–1543 to replace the destroyed Romanesque bridge from 1133. It was adorned from 1730 on in two phases with well-known statues … Continue reading
Posted in Arch structures, Historic Bridges, Newton
Tagged arch, Austria, bridges, Germany
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Trigonometric Functions in VBA – Update
In this post from February a set of VBA trigonometric functions were presented, using the derivations given on the Microsoft Developer Network site: Derived Math Functions Unfortunately two of the functions were wrong; the correct versions are shown below: Inverse Secant … Continue reading
The Moon Smiles on Brisbane Water
Astronomy Picture of the Day for Friday Dec 5th: “Explanation: At sunset, Monday’s western sky showed off stunning colors and dramatic clouds reflected in Brisbane Water on the Central Coast of New South Wales, Australia. It also featured the remarkable conjunction … Continue reading
Linking Excel to Fortran – 2
In this post the procedures described for C++ here will be replicated for Fortran: The spreadsheet, fortran source code, and compiled dll described in this code may be downloaded from Cubic.zip As always, it is better to use the downloaded code, … Continue reading
Posted in Excel, Fortran, Link to dll, Maths, UDFs, Uncategorized, VBA
Tagged Cubic, Excel, Fortran, Quadratic, UDF, VBA
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