The Ecfun package includes a function "as.Date1970", that merely
provides a default origin for "as.Date".
This kind of thing can be found using
library(sos)
findFn('as.Date1970')
This produced a list in my default browser showing 4 links in 3
packages, the first 2 of which were for this.
Hope this helps.
Spencer
On 3/8/2015 9:51 AM, Bert Gunter wrote:
Please read ?as.Date carefully. Your argument appears to be numeric
(??) and you do not seem to have specified an origin:
"as.Date will accept numeric data (the number of days since an epoch),
but only if origin is supplied."
Cheers,
Bert
Bert Gunter
Genentech Nonclinical Biostatistics
(650) 467-7374
"Data is not information. Information is not knowledge. And knowledge
is certainly not wisdom."
Clifford Stoll
On Sat, Mar 7, 2015 at 5:49 PM, Steve Archambault <archste...@gmail.com> wrote:
Hi all,
I am trying in vain to create a new object "Year" in my data frame from
existing Date data. I have tried many different approaches, but can't seem
to get it to work. Here is an example of some code I tried.
date1<- as.Date(wells$Date,"%m/%d/%Y")
wells$year<-as.numeric(format(date1, "%Y"))
I am starting with data that looks like this.
ID Date DepthtoWater_bgs test test2
1 BC-0004 41163 260.60 3 1
2 BC-0004 41255 261.65 4 2
3 BC-0003 41345 166.58 5 3
4 BC-0002 41351 317.85 6 4
5 BC-0004 41355 262.15 7 5
6 BC-0003 41438 167.55 8 6
7 BC-0004 41438 265.45 9 7
8 BC-0002 41443 317.25 10 8
9 BC-0002 41521 321.25 11 9
10 BC-0003 41522 168.65 12 10
11 BC-0004 41522 266.15 13 11
12 BC-0003 41627 168.95 14 12
13 BC-0004 41627 265.25 15 13
14 BC-0002 41634 312.31 16 14
15 BC-0003 41703 169.25 17 15
16 BC-0004 41703 265.05 18 16
17 BC-0002 41710 313.01 19 17
18 BC-0003 41795 168.85 20 18
19 BC-0004 41795 266.95 21 19
20 BC-0002 41801 330.41 22 20
21 BC-0003 41905 169.75 23 21
22 BC-0004 41905 267.75 24 22
23 BC-0002 41906 321.01 25 23
Any help would be greatly appreciated!
-Steve
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