On Oct 19, 2010, at 1:30 PM, Phil Spector wrote:
The following will create a POSIXlt object using the current date:
strptime(sprintf('%06d',breaks),'%H%M%S')
[1] "2010-10-19 07:00:00" "2010-10-19 07:15:00" "2010-10-19 07:30:00"
[4] "2010-10-19 07:45:00" "2010-10-19 08:00:00" "2010-10-19 08:15:00"
[7] "2010-10-19 08:30:00" "2010-10-19 08:45:00" "2010-10-19 09:00:00"
. . .
To get just the hours and minutes, you could use
format(strptime(sprintf('%06d',breaks),'%H%M%S'),'%H:%M')
[1] "07:00" "07:15" "07:30" "07:45" "08:00" "08:15" "08:30" "08:45"
"09:00"
[10] "09:15" "09:30" "09:45" "10:00" "10:15" "10:30" "10:45" "11:00"
"11:15"
. . .
And I'm still not sure I've answered your question.
- Phil Spector
On Tue, 19 Oct 2010, Manta wrote:
I do not think that importing the time as character will help me,
as I need
to perform several operation with them.
Notice that Phil needed to recast these as a character vector with
sprintf() before passing the result to strptime. You cannot do any
(valid) mathematical operations on them such as substraction or
addition, since they should have no numerical values between 60*60 and
2*60*60. Furthermore, any plotting of the "numerical" values will
create illusory gaps. Any operation you do on them needs to first pass
through a stage that recognizes that they do not possess the necessary
attributes to be numbers. I think your resistance to making them
character values in the first place is entirely misguided.
--
David.
Again, maybe I am not able to
express clearly enough. Let's just focus on this series:
breaks
[1] 70000 71500 73000 74500 80000 81500 83000 84500 90000
91500
93000 94500 100000 101500 103000 104500
[17] 110000 111500 113000 114500 120000 121500 123000 124500 130000
131500
133000 134500 140000 141500 143000 144500
[33] 150000 151500 153000 154500 160000 161500 163000 164500 170000
171500
173000 174500 180000 181500 183000 184500
I want a simple function that can convert breaks into a treatable
object by
'zoo' as follows:
[1] 07:00 07:15 07:30 ....
..
[33]...
18:00 18:15 18:30 18:45
Is this possible?
--
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http://r.789695.n4.nabble.com/Chron-object-in-time-series-plot-tp3002285p3002458.html
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______________________________________________
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David Winsemius, MD
West Hartford, CT
______________________________________________
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