[Matplotlib-users] Plotting logging data with dates

[Paul Hobson]

This is a long list of topics that you're asking about, and a lot of it
isn't very clear. I would head over to pandas.pydata.org to learn about
basic time series plotting and resampling.

We can probably better help you if you ask about a specific problem.

On Tue, Mar 19, 2019 at 6:23 PM Kipton Moravec <kip at kdream.com> wrote:

> I am new and have been reading and playing with the tutorials.  I have
> not seen what I need to do.
>
> I am collecting data on some machines every second. I collect
> temperature, input voltage, and percentage of the time on. It is two
> machines (for time on),  4-8 temperatures, and 4 voltages.
>
> it comes to me as a csv file or line, with Date, time, and then all the
> values comma separated.
>
> I can rearrange the data to however Matplotlib requires in Python. That
> is not the issue.
>
> I do not know how to plot the date/time x-axis.
>
> The user wants to look at the past hour, past day, past week, past
> month, and past year.
>
> For the plot of the last hour I need a line and the time every 10
> minutes on the x axis.
>
> For the plot of the day, probably a vertical line every hour and a label
> every 3 hours.
>
> For the plot of the week, a line at midnight, and a day label between
> the lines.
>
> For the plot of the month, I do not know what might work.
>
> For the plot of the year, a line between the month and the month between
> the lines.
>
> I want all the data (or a good portion of it) between the axis markers.
>
> How do I do this, or find examples or documentation on how to work with
> time and dates for the x-axis?
>
> I found
> https://blog.mafr.de/2012/03/11/time-series-data-with-matplotlib/ which
> helped me a lot. I did not know about strpdate2num.  But I think I need
> a date&time equivalent. Is there such a thing? Where would I find it? Or
> do I have to make it?
>
> I had a friend suggest going with MRTG because it produces the graphs
> clost to what I want. That looked harder.
>
> People log data by time and date and graph it all the time. Something
> like this has got to have been done before.
>
> Kip
>
>
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