Hi, What is the reason for seq.Date to require the 'by' argument and not to default it to 1 in the example below?> seq(from=as.Date("1996-01-01"), to=as.Date("1996-12-01"))Error in seq.Date(from = as.Date("1996-01-01"), to as.Date("1996-12-01")) : exactly two of `to', `by' and `length.out' / `along.with' must be specified This is R-1.9.1, but I haven't seen anything pertaining in the release notes of 2.0.x. Thanks, Vadim
On Fri, 3 Dec 2004, Vadim Ogranovich wrote:> What is the reason for seq.Date to require the 'by' argument and not to > default it to 1 in the example below? > > > > seq(from=as.Date("1996-01-01"), to=as.Date("1996-12-01")) > Error in seq.Date(from = as.Date("1996-01-01"), to > as.Date("1996-12-01")) : > exactly two of `to', `by' and `length.out' / `along.with' must be > specified >>From a programming aspect, default to 1 what? day? hour?minute? second? microsecond? How would it determine what unit you desired from the [pre]converted value it received as an argument? ---------------------------------------------------------- SIGSIG -- signature too long (core dumped)
This is not too convincing. The following works:> seq(from=as.Date("1996-01-01"), to=as.Date("1996-12-01"), by=1)so how does the system know that 1 is one day? Thanks, Vadim> -----Original Message----- > From: r-devel-bounces@stat.math.ethz.ch > [mailto:r-devel-bounces@stat.math.ethz.ch] On Behalf Of Paul Roebuck > Sent: Friday, December 03, 2004 2:17 PM > To: R Devel Mailing List > Subject: Re: [Rd] seq.Date requires by > > On Fri, 3 Dec 2004, Vadim Ogranovich wrote: > > > What is the reason for seq.Date to require the 'by' > argument and not > > to default it to 1 in the example below? > > > > > > > seq(from=as.Date("1996-01-01"), to=as.Date("1996-12-01")) > > Error in seq.Date(from = as.Date("1996-01-01"), to > > as.Date("1996-12-01")) : > > exactly two of `to', `by' and `length.out' / `along.with' must be > > specified > > > > >From a programming aspect, default to 1 what? day? hour? > minute? second? microsecond? How would it determine what unit > you desired from the [pre]converted value it received as an argument? > > ---------------------------------------------------------- > SIGSIG -- signature too long (core dumped) > > ______________________________________________ > R-devel@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel >
Don't know the answer to your question but note
that chron can do it without by=.
xD <- as.Date("1996-01-01")
yD <- as.Date("1996-12-01")
library(chron)
xc <- chron(xD)
yc <- chron(yD)
seq(xc, yc)
# Also one can do this in either chron or Date:
chron(xc:yc)
as.Date(xD:yD)
Date: Fri, 3 Dec 2004 11:29:08 -0800
From: Vadim Ogranovich <vograno@evafunds.com>
To: <r-devel@stat.math.ethz.ch>
Subject: [Rd] seq.Date requires by
Hi,
What is the reason for seq.Date to require the 'by' argument and not to
default it to 1 in the example below?
> seq(from=as.Date("1996-01-01"),
to=as.Date("1996-12-01"))
Error in seq.Date(from = as.Date("1996-01-01"), to
as.Date("1996-12-01")) :
exactly two of `to', `by' and `length.out' / `along.with' must
be
specified
This is R-1.9.1, but I haven't seen anything pertaining in the release
notes of 2.0.x.
Thanks,
Vadim
Oops. I had my own as.Date routines loaded. (These
will be made available in the next version of zoo
but here they are in the meantime.)
If you want to get the as.Date(xD:yD) and similar
to come out you should define these:
as.Date.numeric <- function (x, ...)
structure(floor(x + 0.001), class = "Date")
as.Date.integer <- function (x, ...)
structure(x, class = "Date")
Date: Fri, 3 Dec 2004 21:42:37 -0500 (EST)
From: Gabor Grothendieck <ggrothendieck@myway.com>
To: <vograno@evafunds.com>, <r-devel@stat.math.ethz.ch>
Subject: RE: [Rd] seq.Date requires by
Don't know the answer to your question but note
that chron can do it without by=.
xD <- as.Date("1996-01-01")
yD <- as.Date("1996-12-01")
library(chron)
xc <- chron(xD)
yc <- chron(yD)
seq(xc, yc)
# Also one can do this in either chron or Date:
chron(xc:yc)
as.Date(xD:yD)
Date: Fri, 3 Dec 2004 11:29:08 -0800
From: Vadim Ogranovich <vograno@evafunds.com>
To: <r-devel@stat.math.ethz.ch>
Subject: [Rd] seq.Date requires by
Hi,
What is the reason for seq.Date to require the 'by' argument and not to
default it to 1 in the example below?
> seq(from=as.Date("1996-01-01"),
to=as.Date("1996-12-01"))
Error in seq.Date(from = as.Date("1996-01-01"), to
as.Date("1996-12-01")) :
exactly two of `to', `by' and `length.out' / `along.with' must
be
specified
This is R-1.9.1, but I haven't seen anything pertaining in the release
notes of 2.0.x.
Thanks,
Vadim