No data sample was provided, so with a verbal description of the problem comes
a verbal answer.
I would use expand.grid to build a set of all desired date/time combinations,
then use the merge function to select rows in your actual data.
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Sent from my phone. Please excuse my brevity.
jck13 <jennake...@hotmail.com> wrote:
>Hello,
>
>I have a csv with 5months of hourly data for 4 years. I would like to
>get
>9am, 12pm and 3pm from each day and create a subset or a new data
>frame
>that I can analyze. The time are from hour 0-23 for each day.
>I am not sure how to create a loop which will take out each of these
>hours
>and create a subset.
>
>I was thinking of doing a for loop using the row number since:
>9am= row 10
>12pm= row 13
>3pm= row 16
>
>trying to loop through to extract these 3 times each day.
>
>n=length(date_stamp)
>
>for (i in i:n) {
>m= 10
>i= 1
>new1= mv[m,]
>i= i+1
>m= m+3
>##m+18 at row 16?
>}
>
>I need some help creating a loop through this! Thank you!
>
>
>--
>View this message in context:
>http://r.789695.n4.nabble.com/Selecting-3-different-hours-in-a-day-tp4015010p4015010.html
>Sent from the R help mailing list archive at Nabble.com.
>
>______________________________________________
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>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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