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Category Archives: Charts
Plotting Charts With Gaps …
“How do you get VB6 to initialize doubles with +infinity, -infinity and NaN”… and various sorts of Not a Number. Back in 2012 (When is an xy chart not an xy chart) I concluded that it was not possible to … Continue reading
Posted in Arrays, Charts, Charts, Excel, UDFs, VBA
Tagged Chart, NaN, plot blank, XY chart with gaps
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Using Matplotlib from Excel with xlwings – update
In February 2016 I posted a spreadsheet with examples of linking to the Python Matplotlib library with xlwings. Since then updates to xlwings required some changes to the python code, specifically plot.show has been replaced with pictures.add. The spreadsheet has … Continue reading
Posted in Charts, Charts, Excel, Link to Python, Newton, NumPy and SciPy, VBA
Tagged Excel, MatPlotlib, Python, update, VBA, xlMatPlot, xlwings, xlwScipy
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Displaying trend line equations on line charts
This post is prompted by a recent comment at Using LINEST for non-linear curve fitting which found that the trend line formula displayed on a chart was totally different from that found using the Linest function. The problem was caused by using a … Continue reading
Posted in Charts, Charts, Excel, Maths
Tagged Chart, Excel, Show trend line equation, Trend line
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Editing Charts with the mouse
When editing chart ranges, to either change the limits of the range, or select a new column, I have been in the habit of either selecting a range and editing the text in the Formula Edit Bar, or right clicking, … Continue reading
A mystery curve links to Jupyter
Reviewing some of my less visited links recently, I was intrigued by a post at The Math Less Travelled: The previous post at the site provides more details of the source of the curve, and some links to an interactive … Continue reading
Posted in Charts, Charts, Excel, Maths, Newton
Tagged curve generator, Excel, Jupyter, Maths, parametric curve, Python, Scatter chart
2 Comments
Baby Names and Pivot Tables
Baby Boom: An Excel Tutorial on Analyzing Large Data Sets is a comprehensive (and free) tutorial looking at analysing public databases of baby names, using Excel: There are professional data analysts out there who tackle “big data” with complex software, … Continue reading
Posted in Charts, Excel
Tagged Analysing data, Excel, large data sets, Pivot charts, pivot tables, tutorial
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EvalA update and examples
The EvalA User Defined Function (UDF) has been included in the Eval2 and Eval-Integration spreadsheets for some time, but was not documented. That has now been fixed, and both spreadsheets can be downloaded from Eval2.Zip (including full open-source code). The … Continue reading
Posted in Arrays, Charts, Excel, Maths, Newton, UDFs, VBA
Tagged EvalA function, evaluation of text strings, Excel, UDF, VBA
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