[R] Selecting 3 different hours in a day

[jck13]

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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