R help - May 2013 - Declare a set (list?) of many dataframes or matrices

Hi,

   I would like to read several datasets and would like to create a set
(list? sequence?) of many empty dataframes. How could this be done? How
could I declare a  set (list? sequence?) of many empty matrices?

   Thanks,

Miao

	[[alternative HTML version deleted]]

Hello,

I can't say I understand the question, but if you want a list of empty 
dfs and a list of empty matrices, the following will do.

replicate(10, data.frame())
replicate(10, matrix(NA, nrow = 0, ncol = 0))


Hope this helps,

Rui Barradas

Em 03-05-2013 16:20, jpm miao escreveu:
> Hi,
>
>     I would like to read several datasets and would like to create a set
> (list? sequence?) of many empty dataframes. How could this be done? How
> could I declare a  set (list? sequence?) of many empty matrices?
>
>     Thanks,
>
> Miao
>
> 	[[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.
>

Hi,
I am not sure about what you meant.
lapply(1:5,function(i) data.frame())
[[1]]
data frame with 0 columns and 0 rows

[[2]]
data frame with 0 columns and 0 rows

[[3]]
data frame with 0 columns and 0 rows

[[4]]
data frame with 0 columns and 0 rows

[[5]]
data frame with 0 columns and 0 rows

A.K.


----- Original Message -----
From: jpm miao <miaojpm at gmail.com>
To: r-help <r-help at r-project.org>
Cc: 
Sent: Friday, May 3, 2013 11:20 AM
Subject: [R] Declare a set (list?) of many dataframes or matrices

Hi,

?? I would like to read several datasets and would like to create a set
(list? sequence?) of many empty dataframes. How could this be done? How
could I declare a? set (list? sequence?) of many empty matrices?

?? Thanks,

Miao

??? [[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.