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Category Archives: Curve fitting
CSpline and Malware
I was recently informed that the Malwarebyte program was raising a warning for the CSpline2 download. On checking I found that the spreadsheet had a VBA module called frmPickwb which was not my code. The file has now been updated, … Continue reading
Posted in Computing - general, Curve fitting, UDFs, VBA
Tagged CSpline2, malware, Malwarebyte
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Deflections and Moments in Rectangular Plates
Following a question here I have compared tabulated coefficients for deflections and bending moments in a rectangular plate with results of a Strand7 analysis using 8 noded plate/shell elements. The results are summarised below, and in a spreadsheet which also … Continue reading
Posted in Beam Bending, Curve fitting, Excel, Finite Element Analysis, Newton
Tagged Excel, FEA, Linest, Moody, Pilkey, plate bending, plate deflections, Plate stresses, Roark, Strand7, Timoshenko
2 Comments
LinEstGap with non-linear functions
The LinEstGap user defined function (UDF) allows the built-in Linest function to be used on data with empty cells or hidden rows, returning results that agree with the chart trend-line function, which automatically ignores blank cells and hidden data. It … Continue reading
Posted in Arrays, Curve fitting, Excel, Maths, Newton, UDFs, VBA
Tagged Excel, Exponential curves, Linest, Linest with gaps, Log curves, non-linear curve fitting, Polynomial curves, Power curves, UDF, VBA
1 Comment
DigitGraph Spreadsheet and WebPlot Digitiser
I have posted here previously a spreadsheet that allows XY data to be extracted from images of graphs, maps or other images of objects in a single plane: How to digitise a scanned image. I have updated the instructions for the … Continue reading
Posted in Charts, Charts, Computing - general, Curve fitting, Drawing, Excel, UDFs, VBA
Tagged DigitGraph, digitize scanned image, Excel, UDF, VBA, WebPlot Digitizer
5 Comments
Asymmetric Catenary Function
Back in 2009, I posted a user defined function (UDF) to generate a catenary curve, that could be used together with the Excel Solver to generate a curve of a specified span and sag: A catenary function Following a discussion … Continue reading
Posted in Coordinate Geometry, Curve fitting, Excel, Maths, Newton, UDFs, xlwings
Tagged Catenary, Excel, Solver, UDF, VBA
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