Selecting 3 different hours in a day
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 <jennakeane at 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!
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