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Utility to make graphs from a text file of data

Red Squirrel

Red Squirrel

No Lifer
Say I have a text file with data that has the date and value per entry, is there an app that can generate a graph based on those values? If there's a bunch of values for a time range that are missing, then it should leave a space. Date would be in unix format. Basically, something like this:

1348705000, 24.6
1348705050, 24.8
1348705100, 24.7
etc

I am writing an environmental monitoring tool and I want to also add graph capabilities to it but if there is a tool out there that can do that for me, it will save me lot of time. Basically I'm looking for MRTG style graphs. Idealy I'd want rollup graphs, so hourly, daily, weekly, monthly, yearly, type deal. Though it would not be a big deal to code that into my app to generate those appropriate files.
 
There's also rrdtool which is designed specifically for time series data. It creates the database and does the graphing and you can run it through pipes, so it's easily automated.
 
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