Re: [R] strange Sys.Date() side effect
Basically I want to create a string vector where first element is a
date.
Note that if you supply c() with objects of different types (as you
have),
the results will probably not be what you wanted.
This is the key. I assumed (not correctly)
that Sys.Date() generates a character
Sys.Date()
[1] 2012-01-13
but as you point out:
class(Sys.Date())
[1] Date
and it is the best to provide c() with arguments of the same type
so, in the end, explicitely casting Sys.Date() to character works for
me:
N - 2; c(as.character(Sys.Date()), sprintf('N=%d', N))
[1] 2012-01-13 N=2
Thanks!
Ryszard
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-Original Message-
From: MacQueen, Don [mailto:macque...@llnl.gov]
Sent: Thursday, January 12, 2012 5:27 PM
To: Czerminski, Ryszard; r-help@r-project.org
Subject: Re: [R] strange Sys.Date() side effect
My best guess is that you are misunderstanding what the c() function
does.
I'd suggest reading the help page for c, obtained by typing
?c
Note that if you supply c() with objects of different types (as you
have),
the results will probably not be what you wanted.
Given what c() does, your output and warning message make sense. But I'm
unable to figure out what you're really trying to do. Something like
this,
perhaps?
N - 2; sprintf('N = %d', N)
[1] N = 2
-Don
--
Don MacQueen
Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062
On 1/10/12 5:04 AM, Czerminski, Ryszard
ryszard.czermin...@astrazeneca.com wrote:
Any ideas what is the problem with this code?
N - 2; c(Sys.Date(), sprintf('N = %d', N))
[1] 2012-01-10 NA
Warning message:
In as.POSIXlt.Date(x) : NAs introduced by coercion
Best regards,
Ryszard
Ryszard Czerminski
AstraZeneca Pharmaceuticals LP
35 Gatehouse Drive
Waltham, MA 02451
USA
781-839-4304
ryszard.czermin...@astrazeneca.com
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Re: [R] strange Sys.Date() side effect
My best guess is that you are misunderstanding what the c() function does.
I'd suggest reading the help page for c, obtained by typing
?c
Note that if you supply c() with objects of different types (as you have),
the results will probably not be what you wanted.
Given what c() does, your output and warning message make sense. But I'm
unable to figure out what you're really trying to do. Something like this,
perhaps?
N - 2; sprintf('N = %d', N)
[1] N = 2
-Don
--
Don MacQueen
Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062
On 1/10/12 5:04 AM, Czerminski, Ryszard
ryszard.czermin...@astrazeneca.com wrote:
Any ideas what is the problem with this code?
N - 2; c(Sys.Date(), sprintf('N = %d', N))
[1] 2012-01-10 NA
Warning message:
In as.POSIXlt.Date(x) : NAs introduced by coercion
Best regards,
Ryszard
Ryszard Czerminski
AstraZeneca Pharmaceuticals LP
35 Gatehouse Drive
Waltham, MA 02451
USA
781-839-4304
ryszard.czermin...@astrazeneca.com
--
Confidentiality Notice: This message is private and may ...{{dropped:11}}
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[R] strange Sys.Date() side effect
Any ideas what is the problem with this code?
N - 2; c(Sys.Date(), sprintf('N = %d', N))
[1] 2012-01-10 NA
Warning message:
In as.POSIXlt.Date(x) : NAs introduced by coercion
Best regards,
Ryszard
Ryszard Czerminski
AstraZeneca Pharmaceuticals LP
35 Gatehouse Drive
Waltham, MA 02451
USA
781-839-4304
ryszard.czermin...@astrazeneca.com
--
Confidentiality Notice: This message is private and may ...{{dropped:11}}
__
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] strange Sys.Date() side effect
On 12-01-10 8:04 AM, Czerminski, Ryszard wrote:
Any ideas what is the problem with this code?
N- 2; c(Sys.Date(), sprintf('N = %d', N))
[1] 2012-01-10 NA
Warning message:
In as.POSIXlt.Date(x) : NAs introduced by coercion
You are trying to create a vector combining a Date object and a
character object. R is trying to coerce both objects to dates, and that
fails.
You probably want two strings; so convert the date explicitly:
c(as.character(Sys.Date()), sprintf('N = %d', N))
(or use format or some other function to convert the date to a string.)
Duncan Murdoch
Best regards,
Ryszard
Ryszard Czerminski
AstraZeneca Pharmaceuticals LP
35 Gatehouse Drive
Waltham, MA 02451
USA
781-839-4304
ryszard.czermin...@astrazeneca.com
--
Confidentiality Notice: This message is private and may ...{{dropped:11}}
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R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
