Category Archives: UDFs

Linking Excel to C

One of the reasons often given for preferring programs like Matlab to Excel for scientific and engineering uses is the large body of specialist mathematical and scientific applications available to these programs.  In this and following posts I will describe how … Continue reading

Posted in Excel, Link to dll, UDFs, VBA | Tagged , , , | 28 Comments

Solving simultaneous equations

Solving a series of simultaneous equations is a task frequently required in engineering and scientific analysis.  Excel provides the tools to perform this task quickly and easily, but the procedure is not documented in the on-line help (so far as … Continue reading

Posted in Arrays, Excel, Maths, UDFs, VBA | Tagged , , , , | 5 Comments

Reinforced Concrete Section Analysis – 5; Ultimate Limit State

Previous posts in this series have looked at the analysis of beams where the steel stress is within the elastic range, and the concrete stress is sufficiently low that the assumption of linear elastic behaviour in compression is a reasonable approximation.  … Continue reading

Posted in Beam Bending, Excel, UDFs | Tagged , , , , , , , | 5 Comments

Intersections, interpolations, and rotations

Amongst the many and varied functions provided by Excel (or as far as I know any other spreadsheet) there are none that provide a one step process for linear interpolation, finding the intersection points of lines, or conversion between polar … Continue reading

Posted in Coordinate Geometry, Excel, UDFs, VBA | Tagged , , , , , , | 37 Comments

Evaluate Function – update

Previous post The evaluate function described in the previous post has been used in writing a UDF that will evaluate the integral of any suitable function over a specified range. The revised worksheet can be downloaded from: Eval.zip

Posted in Excel, Maths, UDFs | Tagged , , , , | 5 Comments