R help - Apr 2011 - Empty Data Frame

Dear Group,

Is there a more efficient way to create a data frame structure (using rep I
guess?)

require(plyr)

week <- rdply(10, data.frame(week = 1:52))
names(week) <- c("Year", "Week")
week$Year <- week$Year + 2000

Basically trying to create a year and week data frame to start appending
data to for a ggplot.

Many thanks.

	[[alternative HTML version deleted]]

Hi:

You could try something like

df <- data.frame( expand.grid( Week = 1:52, Year = 2002:2011 ))
dim(df)
head(df)

The first variable changes faster than the second.

HTH,
Dennis

On Wed, Apr 27, 2011 at 1:03 AM, Santosh Srinivas
<santosh.srinivas at gmail.com> wrote:
> Dear Group,
>
> Is there a more efficient way to create a data frame structure (using rep I
> guess?)
>
> require(plyr)
>
> week <- rdply(10, data.frame(week = 1:52))
> names(week) <- c("Year", "Week")
> week$Year <- week$Year + 2000
>
> Basically trying to create a year and week data frame to start appending
> data to for a ggplot.
>
> Many thanks.
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.
>

On Wed, Apr 27, 2011 at 4:58 AM, Dennis Murphy <djmuser at gmail.com>
wrote:
> Hi:
>
> You could try something like
>
> df <- data.frame( expand.grid( Week = 1:52, Year = 2002:2011 ))
expand.grid already returns a data frame...  You might want
KEEP.OUT.ATTRS = F though.  Even it feels like you are yelling at R.

Hadley


-- 
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/