Monthly Archives: April 2012

Oh dear – an elliptical circle!

When connected to a data projector, have you ever found that your circles are elliptical, even though you have “Equal Aspect” clicked on in Autograph?

Most wide-screen laptops are 16:10 aspect, and switch automatically to 4:3 (using 1024 x 768) when connected to a data projector.  The problem illustrated here arises with more modern projectors that can handle wide-screen, but usually to the ‘TV’ standard 16:9.  The laptop is likely to be in 1280 x 800 (16:10). The solution is to change your laptop (if you can!!) to 1280 x 720 (16:9). Older graphics cards will not offer this, in which case you should switch the projector to 4:3 aspect.

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Autograph: two ideas for Physics teaching


The are many features of Autograph that teachers of Physics or Applied Mathematics will find useful. In these videos I explain how to set up variables other than ‘x’ and ‘y’ and apply them to different situations.

1. A distance-time graph
– watch the YouTube video   –   download the agg file

2. Using ‘Best Fit’ to fit a trig model to a set of periodic data

– watch the YouTube video   –   download the agg file