[R] chron - when seconds data not included

[Tubin]

Works like a charm!  Thanks.


Gabor Grothendieck wrote:
> 
> On Mon, Dec 8, 2008 at 11:52 PM, Tubin <sredmonson at yahoo.com> wrote:
>>
>> I have date and time data which looks like this:
>>
>>      [,1]     [,2]
>>  [1,] "7/1/08" "9:19"
>>  [2,] "7/1/08" "9:58"
>>  [3,] "7/7/08" "15:47"
>>  [4,] "7/8/08" "10:03"
>>  [5,] "7/8/08" "10:32"
>>  [6,] "7/8/08" "15:22"
>>  [7,] "7/8/08" "15:27"
>>  [8,] "7/8/08" "15:40"
>>  [9,] "7/9/08" "10:25"
>> [10,] "7/9/08" "10:27"
>>
>> I would like to use chron on it, so that I can calculate intervals in
>> time.
>>
>> I can't seem to get chron to accept the time format that doesn't include
>> seconds.  Do I have to go through and append :00 on every line in order
>> to
>> use chron?
> 
> 
> 
> That's one way:
> 
> m <- matrix( c("7/1/08","9:19",
>   "7/1/08","9:58",
>   "7/7/08","15:47",
>   "7/8/08","10:03",
>   "7/8/08","10:32",
>   "7/8/08","15:22",
>   "7/8/08","15:27",
>   "7/8/08","15:40",
>   "7/9/08","10:25",
>   "7/9/08","10:27"), nc = 2, byrow = TRUE)
> 
> chron(m[,1], paste(m[,2], 0, sep = ":"))
> 
> # another is to use as.chron
> 
> as.chron(apply(m, 1, paste, collapse = " "), "%m/%d/%y %H:%M")
> 
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> 
> 

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