I am new to R and have been struggling with the following problem. I apologize
if there is an obvious answer that I have missed.
I bring in a .txt file (pyr_h.txt) that has a DateTime column in the format
"yyyy-mm-dd HH:MM"
When it comes into R, R does not recognize it as a date/time format.
Date Time DateTime N_Wm2 S_Wm2
1 4/1/2008 01:00 2008-04-01 01:00 0.0000 0.00000
2 4/1/2008 02:00 2008-04-01 02:00 0.0000 0.00000
3 4/1/2008 03:00 2008-04-01 03:00 0.0000 0.00000
4 4/1/2008 04:00 2008-04-01 04:00 0.0000 0.00000
5 4/1/2008 05:00 2008-04-01 05:00 0.0000 0.00000
6 4/1/2008 06:00 2008-04-01 06:00 3.1655 2.56175
CODE:
pyr_h = read.table("H:/MastersInfo/data/Figures/Tables/pyr_h.txt",header = T,
sep = "\t")
# convert Date to date format
pyr_h$Date = as.Date(pyr_h$Date, format = "%m/%d/%Y")
# convert DateTime to number format
pyr_h$DateTime = strptime(pyr_h$DateTime, format="%Y-%m-%d %H:%M")
This strptime command works on another .txt file of mine with the exact same
date/time stamps, but when I try it for this file, it gives the error message:
Error in `$<-.data.frame`(`*tmp*`, "DateTime", value = list(sec = c(0, :
replacement has 9 rows, data has 1570
I tried creating a vector:
tmp <-strptime(pyr_h$DateTime, format="%m/%d/%Y %H:%M")
When I queried the length of this vector, it was 9, yet when I print the vector
there are 1570 objects.
Any idea what is going on here? I have tried formatting the DateTime different
ways in Excel, recreating the .txt file, changing the strptime format, and
rebooting R yet nothing seems to be working.
Thanks SO much!
Kara
Kara Przeczek
M.Sc. Candidate NRES - Environmental Science
University of Northern B.C.
3333 University Way
Prince George B.C V2N 4Z9
Phone: (250) 960-5427
[EMAIL PROTECTED]
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