R help - Aug 2021 - Calculate daily means from 5-minute interval data

I made up fake data in order to avoid showing untested code.
It's not part of the process I was recommending.
I expect data recorded every N minutes to use NA when something
is missing, not to simply not be recorded.  Well and good, all that
means is that reshaping the data is not a trivial call to matrix().
It does not mean that any additional package is needed or appropriate
and it does not affect the rest of the process.

You will want the POSIXct class, see ?DateTimeClasses.
Do you know whether the time stamps are in universal time or in
local time?

Above all, it doesn't affect the point that you probably should not
be doing any of this.

On Tue, 31 Aug 2021 at 00:42, Rich Shepard <rshepard at appl-ecosys.com>
wrote:
>
> On Mon, 30 Aug 2021, Richard O'Keefe wrote:
>
> > Why would you need a package for this?
> >> samples.per.day <- 12*24
> >
> > That's 12 5-minute intervals per hour and 24 hours per day.
> > Generate some fake data.
>
> Richard,
>
> The problem is that there are days with fewer than 12 recorded values for
> various reasons.
>
> When testing algorithms I use small subsets of actual data rather than fake
> data.
>
> Thanks for your detailed procedure.
>
> Regards,
>
> Rich
>
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On Tue, 31 Aug 2021, Richard O'Keefe wrote:
> I made up fake data in order to avoid showing untested code. It's not
part
> of the process I was recommending. I expect data recorded every N minutes
> to use NA when something is missing, not to simply not be recorded. Well
> and good, all that means is that reshaping the data is not a trivial call
> to matrix(). It does not mean that any additional package is needed or
> appropriate and it does not affect the rest of the process.
Richard,

The instruments in the gauge pipe don't know to write NA when they're
not
measuring. :-) The outage period varies greatly by location, constituent
measured, and other unknown factors.
> You will want the POSIXct class, see ?DateTimeClasses. Do you know whether
> the time stamps are in universal time or in local time?
The data values are not timestamps. There's one column for date a second
colume for time and a third column for time zone (P in the case of the west
coast.
> Above all, it doesn't affect the point that you probably should not
> be doing any of this.
? (Doesn't require an explanation.)

Rich