On Wed, Feb 04, 2026 at 09:44:08AM +0000, Chris Green wrote: > Chris Green <[email protected]> wrote: > > I'm looking for a program to do simple chart plotting, e.g. I have > > some voltage measurements taken (say) once a minute and I want to > > display how the voltage varies over (say) a day. So that's 1440 > > measurements. > > > > This can be web or desktop, all I want is a window with a line drawn > > across it really, a scale would be handy and the ability to show more > > than one plot (e.g. voltage and current maybe). > > > > Source of data will almost certainly be a database as the data will be > > coming from a headless Raspberry Pi and I already have that set up > > writing values to a sqlite3 database. Obviously I can change the data > > format, it is pretty simple to change it to CSV or whatever. > > > > Searching the main Debian repositories has brought up very little, > > just a couple of libraries but no actual, runnable, programs. > > > > Can anyone suggest anything that will do what I want? > > > I was using the wrong "Look in" in my synaptic search, so I have found > some possibilities now.
The canonical answer is still gnuplot (although there are lots of other solutions which are rather numerical/statistical packages with very useful plotting capabilities, like R or NumPy). > However a program that will specifically allow 'compressing' the > horizontal axis so that it can handle more points than will actually > fit by averaging values would be ideal. So I'd still appreciate some > ideas. For gnuplot, something like this? https://stackoverflow.com/questions/42855285/plotting-average-curve-for-points-in-gnuplot Cheers -- t
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