[R] Date calculation
Dear all R users,
Suppose I have a data frame data like this:
5/2/2006 36560
5/3/2006 36538
5/4/2006 36452
5/5/2006 36510
5/8/2006 36485
5/9/2006 36502
5/10/2006 36584
5/11/200636571
Now I want to create a for loop like this:
date = 5/10/2006
for (i in 1: 8)
{
if (data[i,1] date) break
}
But I get error while executing this. Can anyone tell me the right way to do
this?
Sincerely yours
stat
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Re: [R] Date calculation
test
V1V2
1 5/2/2006 36560
2 5/3/2006 36538
3 5/4/2006 36452
4 5/5/2006 36510
5 5/8/2006 36485
6 5/9/2006 36502
7 5/10/2006 36584
8 5/11/2006 36571
dates - strptime(test$V1, %d/%m/%Y)
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stat stat a écrit :
Dear all R users,
Suppose I have a data frame data like this:
5/2/2006 36560
5/3/2006 36538
5/4/2006 36452
5/5/2006 36510
5/8/2006 36485
5/9/2006 36502
5/10/2006 36584
5/11/200636571
Now I want to create a for loop like this:
date = 5/10/2006
for (i in 1: 8)
{
if (data[i,1] date) break
}
But I get error while executing this. Can anyone tell me the right way to
do this?
Sincerely yours
stat
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Re: [R] Date calculation
Try this:
Lines - 5/2/2006 36560
5/3/2006 36538
5/4/2006 36452
5/5/2006 36510
5/8/2006 36485
5/9/2006 36502
5/10/2006 36584
5/11/200636571
DF - read.table(textConnection(Lines), as.is = TRUE)
fmt - %m/%d/%Y
DF[,1] - as.Date(DF[,1], fmt)
date - as.Date(5/10/2006, fmt)
which.max(DF[,1] date)
On 6/9/06, stat stat [EMAIL PROTECTED] wrote:
Dear all R users,
Suppose I have a data frame data like this:
5/2/2006 36560
5/3/2006 36538
5/4/2006 36452
5/5/2006 36510
5/8/2006 36485
5/9/2006 36502
5/10/2006 36584
5/11/200636571
Now I want to create a for loop like this:
date = 5/10/2006
for (i in 1: 8)
{
if (data[i,1] date) break
}
But I get error while executing this. Can anyone tell me the right way to do
this?
Sincerely yours
stat
Send instant messages to your online friends http://in.messenger.yahoo.com
Stay connected with your friends even when away from PC. Link:
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[[alternative HTML version deleted]]
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[R] Date Calculation
Hi, I've been playing with: joinDate - format(strptime(as.vector(forum[,2]), %d-%b-%y), +%d-%b-%Y) today - format(strptime(as.vector(14-Jun-04), %d-%b-%Y), + %d-%b-%Y) joinDate [1] 04-Feb-2004 13-Feb-2004 26-Feb-2004 27-Feb-2004 27-Feb-2004 [6] 27-Feb-2004 29-Feb-2004 01-Mar-2004 02-Mar-2004 07-Mar-2004 [11] 08-Mar-2004 17-Mar-2004 20-Mar-2004 22-Mar-2004 22-Mar-2004 [16] 23-Mar-2004 23-Mar-2004 24-Mar-2004 01-Apr-2004 01-Apr-2004 [21] 01-Apr-2004 01-Apr-2004 02-Apr-2004 06-Apr-2004 09-Apr-2004 [26] 11-Apr-2004 14-Apr-2004 03-May-2004 04-May-2004 30-May-2004 [31] 01-Jun-2004 10-Jun-2004 14-Jun-2004 17-Jun-2004 17-Jun-2004 today [1] 14-Jun-0004 joinDate - today Error in joinDate - today : non-numeric argument to binary operator But it didn't quite work. What I'd like joinDate - today to return is the number of days to today, since joinDate. I'm sure it has been asked before however a search on r-help didn't found me any relevant information *_*. Cheers, Kevin Ko-Kang Kevin Wang, MSc(Hon) SLC Stats Workshops Co-ordinator The University of Auckland New Zealand __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Date Calculation
KKWa == Ko-Kang Kevin Wang [EMAIL PROTECTED] on Thu, 17 Jun 2004 19:57:39 +1200 writes: KKWa Hi, KKWa I've been playing with: joinDate - format(strptime(as.vector(forum[,2]), %d-%b-%y), KKWa +%d-%b-%Y) today - format(strptime(as.vector(14-Jun-04), %d-%b-%Y), KKWa + %d-%b-%Y) joinDate KKWa [1] 04-Feb-2004 13-Feb-2004 26-Feb-2004 27-Feb-2004 KKWa 27-Feb-2004 KKWa [6] 27-Feb-2004 29-Feb-2004 01-Mar-2004 02-Mar-2004 KKWa 07-Mar-2004 KKWa today KKWa [1] 14-Jun-0004 joinDate - today KKWa Error in joinDate - today : non-numeric argument to binary operator KKWa But it didn't quite work. What I'd like joinDate - KKWa today to return is the number of days to today, since KKWa joinDate. I'm sure it has been asked before however a KKWa search on r-help didn't found me any relevant KKWa information *_*. Kevin, [[did you have tough day? usually your Q/A are much better ;-()]] both joinDate and today are results of format() and hence character vectors (with no time information left). You didn't really expect - to work with characters? OTOH, - properly does work with POSIX*t objects, see, e.g., ?difftime Regards, Martin __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Date Calculation
You have formatted the dates, so you are trying to subtract character strings. Convert to Date instead (although you can subtract POSIXlt dates). On Thu, 17 Jun 2004, Ko-Kang Kevin Wang wrote: Hi, I've been playing with: joinDate - format(strptime(as.vector(forum[,2]), %d-%b-%y), +%d-%b-%Y) today - format(strptime(as.vector(14-Jun-04), %d-%b-%Y), + %d-%b-%Y) joinDate [1] 04-Feb-2004 13-Feb-2004 26-Feb-2004 27-Feb-2004 27-Feb-2004 [6] 27-Feb-2004 29-Feb-2004 01-Mar-2004 02-Mar-2004 07-Mar-2004 [11] 08-Mar-2004 17-Mar-2004 20-Mar-2004 22-Mar-2004 22-Mar-2004 [16] 23-Mar-2004 23-Mar-2004 24-Mar-2004 01-Apr-2004 01-Apr-2004 [21] 01-Apr-2004 01-Apr-2004 02-Apr-2004 06-Apr-2004 09-Apr-2004 [26] 11-Apr-2004 14-Apr-2004 03-May-2004 04-May-2004 30-May-2004 [31] 01-Jun-2004 10-Jun-2004 14-Jun-2004 17-Jun-2004 17-Jun-2004 today [1] 14-Jun-0004 joinDate - today Error in joinDate - today : non-numeric argument to binary operator But it didn't quite work. What I'd like joinDate - today to return is the number of days to today, since joinDate. I'm sure it has been asked before however a search on r-help didn't found me any relevant information *_*. Cheers, Kevin Ko-Kang Kevin Wang, MSc(Hon) SLC Stats Workshops Co-ordinator The University of Auckland New Zealand __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
RE: [R] Date Calculation
Hi, -Original Message- From: Martin Maechler [mailto:[EMAIL PROTECTED] Kevin, [[did you have tough day? usually your Q/A are much better ;-()]] Thanks to those who have replied, and yes shame on me.. [I also realised I can just use Sys.Date() to get today's date, instead of typing it in..I really had a tough day *_*] Cheers, Kevin __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
