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is where the chart is

There are many things that we can usefully graph around the home, but before we invented GraPL there was often too much effort involved in getting expensive office tools (such as spreadsheets) to produce useful clear graphs of our data.

Now GraPL enables you to easily, and cheaply, produce graphs of everyday data.

These examples show just a few of the many things you may wish to chart, such as fuel costs, tax rates, the positions of your stocks over the last five years etc.

This project uses a simple datasheet and some calculations to plot a running average of the MPG returned by our Rover from new.

The dotted red line summarises the individual readings shown in the blue line (using a moving average function), and makes clear the cyclic pattern in the data, which could be the time of year, or the service interval of the car.

The details of how we constructed this chart are in the fuel tutorial, and the chart is provided in the fuelcalc.gpl example project in the GraPL installation.

GraPL is the perfect tool for recording data from your weather station. The data sheets can be used to record the readings, the inbuilt calculation tools can be used to summarise the data and the advanced plotting engine can then chart the data in an easily readable form.

This chart accurately shows rainfall, daily and cumulative, for Gilling in North Yorkshire for 1999. It is included in the rainfall.gpl sample GraPL project.