Hi,
On Nov 11, 2009, at 1:06 PM, separent wrote:
#Hello,
#I loaded data using read.table - I needed to convert a row in the
data
frame to date class:
data
V1 V2 V3 V4
1 2008-05-19 2008-04-19 2008-03-21 2008-02-22
2 38.16999817 30.70999908 36.86000061 35.18999863
3 37.47999954 29.95000076 36.45999908 35.36000061
4 37.47999954 30.14999962 36.47000122 35.36000061
5 37.84999847 30.56999969 36.84000015 35.74000168
6 38.38999939 31.14999962 37.34000015 36.27000046
7 39.11000061 31.90999985 38.02999878 36.97999954
8 39.81000137 32.65000153 38.68000031 37.63999939
9 40.47000122 33.34999847 39.27999878 38.27000046
data[1,]
V1 V2 V3 V4
1 2008-05-19 2008-04-19 2008-03-21 2008-02-22
dates1<-as.Date(data[1,])
I think this should work if data[1,] returns a vector of characters:
R> d <- c("2008-05-19", "2008-05-30")
R> dd <- as.Date(d)
R> is(dd)
[1] "Date" "oldClass"
Is your first row being treated as factors? Maybe if you convert to
character first it should work?
R> dates1<-as.Date(as.character(data[1,]))
But the fact that it works for as.Date(data[1,1]) make it a bit
weird ...
-steve
do not know how to convert 'dates[1,]' to class "Date"
# However, I can individually convert them all:
dates1.1<-as.Date(data[1,1])
dates1.1
[1] "2008-05-19"
# How can I change the class of the date over the entire row (my
original
file contains more than one hundred rows)?
# Thank you very much.
--
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--
Steve Lianoglou
Graduate Student: Computational Systems Biology
| Memorial Sloan-Kettering Cancer Center
| Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
