Hi,
Did you checked after removing "e" from "formate"?
ortho$test.dat <- as.Date(ortho$xray.date, formate="%d-%b-%y")
A.K.
----- Original Message -----
From: Liz Hare <dogg...@earthlink.net>
To: r-help@r-project.org
Cc:
Sent: Tuesday, July 30, 2013 12:00 PM
Subject: [R] as.Date with characters error
Hello,
I'm trying to convert dates in the format dd-mmm-yy using as.Date.
I have two columns like this, and it works on one but not on the other.
> options(stringsAsFactors=FALSE)
> ortho <- read.csv("test1.csv", header=TRUE, nrows=10)
> ortho
DogID BirthDate xray.date
1 11877 23-Aug-87 15-Feb-88
2 11877 23-Aug-87 15-Feb-88
3 3599 21-Feb-87 21-Feb-88
4 3599 21-Feb-87 21-Feb-88
5 3599 21-Feb-87 21-Feb-88
6 3599 21-Feb-87 21-Feb-88
7 3599 21-Feb-87 21-Feb-88
8 9563 29-Jun-87 29-Jun-88
9 9563 29-Jun-87 29-Jun-88
10 9563 29-Jun-87 29-Jun-88
> ortho$bdat <- as.Date(ortho$BirthDate, format="%d-%b-%y")
> ortho$bdat
[1] "1987-08-23" "1987-08-23" "1987-02-21" "1987-02-21" "1987-02-21"
[6] "1987-02-21" "1987-02-21" "1987-06-29" "1987-06-29" "1987-06-29"
> ortho$test.dat <- as.Date(ortho$xray.date, formate="%d-%b-%y")
Error in charToDate(x) :
character string is not in a standard unambiguous format
> sessionInfo()
R version 3.0.1 (2013-05-16)
Platform: x86_64-w64-mingw32/x64 (64-bit)
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
>
Does anyone have a guess about what's going on? I've googled for this
error but haven't found any where the problem is with this type of
conversion.
Thanks,
Liz
--
Liz Hare PhD
Dog Genetics LLC
dogg...@earthlink.net
http://www.doggenetics.com
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