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# Category Archives: Charts

## XY Chart problems – 2

The previous chart post (XY Chart problems – 1) looked at problems plotting charts with very short data ranges. An associated problem is plotting XY charts with data with gaps (see When is an XY chart not an XY chart …? and … Continue reading

Posted in Arrays, Charts, Charts, Excel, UDFs, VBA
Tagged Charts, Excel, UDFs, VBA, XY chart, XY chart displays as line, XY chart with gaps
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## XY Chart problems – 1

I have looked at problems with XY charts displaying as Line charts previously at: When is an XY chart not an XY chart …? and Plotting Charts With Gaps … The charts shown below. and also in the next post, can be … Continue reading

## 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
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## Plotting Mandelbrot

There are many sites discussing the Mandelbrot Set, but not many examples using VBA to plot the set in Excel, so here is my effort: The spreadsheet (including open source VBA code) may be downloaded from: Mandelbrot chart.zip Note that … Continue reading

Posted in Charts, Charts, Coordinate Geometry, Drawing, Excel, Maths, Newton, VBA
Tagged Charts, Excel, Mandelbrot Set, VBA
3 Comments

## Numerical Integration; Tanh-Sinh Quadrature v. 4.42

Back to Newton and Excel. I recently received a new update to the Tanh-Sinh Quadrature spreadsheet from Graeme Dennes, which may be downloaded from: Tanh_Sinh Quadrature. From the Readme: The Tanh-Sinh quadrature workbook has been enhanced as follows: The Tanh-Sinh … Continue reading

Posted in Charts, Excel, Maths, Newton, Numerical integration, UDFs, VBA
Tagged Double Exponential, Excel, Gauss-Kronrod, numerical integration, Romberg, Tanh-Sinh method, Tanh-Sinh Quadrature, UDF, VBA
10 Comments