Simple interactive plot with variable time axis

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dormant 2022-8-7

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https://ww2.mathworks.cn/matlabcentral/answers/1775490-simple-interactive-plot-with-variable-time-axis

回答： Lei Hou 2022-8-31

I have a plot containing three subplots, all of which have date/time as the x axis.

Whats the easiest way of making this plot interactive, with only the following features:

change the time axis for all three subplots together
autoscale the y axes for the data visible in the plot.

It doesnt have to be a GUI. i'm happy to type xlim at the command prompt, as long as i can say things like 'now' and 'now minus 3 days'.

P.S. The data times are always in UTC, which is 4 hours ahead where i am. every single script i write has manual corrections to UTC. is it possible to get MATLAB to work in UTC by default?

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dormant 2022-8-8

Thanks.

I'm just starting to get to grips with datetime, but slip back to datenum most of the time.

I'll add to this question when I have some working code.

dpb 2022-8-8

Particularly with plotting and if you're writing new code, DEFINITELY ditch datenum in favor of datetime and duration -- plot is now datetime aware and that lets you get rid of the very painful datetick entirely -- plus you can then set limits, ticks, etc., etc., directly in datetime values that don't have to go thru the number conversion to datenum so they're also legible as dates.

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