[R] handling the output of strsplit

[Mark Difford]

Hi Denis,

>> h = c("3h30",      "6h30",      "9h40",      "11h25",     "14h00",      
>> "15h55",  "23h")

>> I could not figure out how to use chron to import this into times, so  
>> I tried to extract the hours and minutes on my own.

Look at ?strptime for this:
##
strptime("6h30", format="%Ih%M")
[1] "2008-06-21 06:30:00"

>> h2 = strsplit(h, "h")...
>> For this in particular, but lists in general, how can one extract the  
>> first item of each element in the list, then the second item of each  
>> element, etc.?

Look at ?"["

## Example: _note_ use of [[...]]
h2[[1]][1]
[1] "3"

h2[[1]][2]
[1] "30"

h2[[1]][1:2]
[1] "3"  "30"

h2[[2]][1:2]
[1] "6"  "30"

HTH, Mark.



Denis Chabot wrote:
> 
> Hi,
> 
> Simple question, but I did not figure out how to find the answer on my  
> own (wrong choice of keywords on my part).
> 
> I have a character variable for time of day that has entries looking  
> like "6h30", "7h40", "12h25", "23h", etc. For the sake of this  
> message, say
> 
> h = c("3h30",      "6h30",      "9h40",      "11h25",     "14h00",      
> "15h55",  "23h")
> 
> I could not figure out how to use chron to import this into times, so  
> I tried to extract the hours and minutes on my own.
> 
> I used strsplit and got a list:
> 
> h2 = strsplit(h, "h")
>  > h2
> [[1]]
> [1] "3"  "30"
> 
> [[2]]
> [1] "6"  "30"
> 
> [[3]]
> [1] "9"  "40"
> 
> [[4]]
> [1] "11" "25"
> 
> [[5]]
> [1] "14" "00"
> 
> [[6]]
> [1] "15" "55"
> 
> [[7]]
> [1] "23"
> 
> It is where I am stuck. I would have like to extract a vector of  
> "hours" from this list, and a vector of "minutes", to reconstruct a  
> time of day.
> 
> But the only command I know, unlist, makes a long vector of h, min, h,  
> min, h, min.
> 
> For this in particular, but lists in general, how can one extract the  
> first item of each element in the list, then the second item of each  
> element, etc.?
> 
> Thanks in advance,
> 
> Denis
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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