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This week, we're updating our course layouts and descriptions. Presentation and materials always gently change over time, but just occasionally there's a need to make a step change to clear out some of the old and roll in the new. That's now happening - but over a long and complex site it's not instant and you'll see sections of the site changing up to and including 19th September.

See also [here] for status update
Matplotlib - graphing in Python - teaching examples

Matplotlib provides Python with a graph drawing and data representation tool that is extremely flexible - in fact so flexible that it's hard for the newcomer to know where to start.

The following examples are very straightforward, but useful, graphs showing real data sets (from the second example onwards) of accesses to our web server last week, plotted against hour of the day. You'll be able to use almost identical code for your first experiments with matplotlib!

The source code links each open in a separate window so that you can see the program and results at the same time

A first easy graph with matplotlibThis is a first "hello matplotlib world" type example that shows fundamental graphing of a data set. [source]

matplotlib - lots of graphs on single axesIn this second example, we have added some labelling and we're using a real data set. The line style and much of the rest remain at defaults. [source]

Web server usage pattern through the day - weekday v weekend (multiple curves, single graph)Plotting differet data sets on the same axes, using a variety of line styles to tell them apart. [source]

Web server usage pattern through the day - weekday v weekend (comparative stacked graphs)I've now added a second graph to the figure, so that you can see how different graphs can be combined. [source]

Web server usage pattern through the day - weekday v weekend (comparative left/right graphs)Finally, the two graphs have been adjusted so that they're left and right, and you'll now see some very significant differences in the weekend and weekday pattern. Truely, a picture paints a thousand words.[source]

Matplotlib is huge - you can do a lot with it, and it's a daunting task at first to find what you need; the above should help newcomers who already have a grounding in Python programming. There's an excellent reference manual once you get deeper in, and you may find the following useful too:

[link]Matplotlib HowTo FAQ
[link]Matplotlib Colours Interface
[link]PyPlot Tutorial
(written 2010-10-10)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Q913 - Object Orientation and General technical topics - Computer Graphics Principles
  [3262] Some SVG Elements, pixel and percent positioning - (2011-04-24)
  [3261] Scalable Vector Graphics - easy, low bandwidth, high resolution, dynamic. - (2011-04-23)
  [3211] Computer Graphics in PHP - World (incoming data) to Pixel (screen) conversion - (2011-03-24)
  [3148] OpenGL / C / C++ - an example to get you started - (2011-01-26)
  [3049] Computer Graphics is fun - even if Java Applets are Old Hat - (2010-11-13)
  [2758] But what will you DO with all those pictures? - (2010-05-09)
  [2633] Why do I teach niche skills rather than mainstream? - (2010-02-13)
  [2245] Client side (Applet) and Server side (Servlet) Graphics in Java - (2009-06-17)

Y118 - Python - numpy, scipy and matplotlib
  [3554] Learning more about our web site - and learning how to learn about yours - (2011-12-17)
  [2997] 3D graphics - web site usage - simple matplotlib and python example - (2010-10-12)
  [2993] Arrays v Lists - what is the difference, why use one or the other - (2010-10-10)
  [2991] Loading and saving data - Python / numpy - (2010-10-09)
  [2990] What are numpy and scipy? - (2010-10-09)

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Loading and saving data - Python / numpy
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Arrays v Lists - what is the difference, why use one or the other
Some other Articles
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A river in Melksham is not just for boaters.
Python - some common questions answered in code examples
Matplotlib - graphing in Python - teaching examples
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Not mugged in London!
Memorial to a day in 1999
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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