[R] when to use textConnection ??

[Gabor Grothendieck]

On Mon, Aug 16, 2010 at 8:00 PM, skan <juanpide at gmail.com> wrote:
>
> I've just seen that sep sep cannot be ","  because there are not commas in
> the file.
> but I want it to take the first and second columns (date and time) as a
> whole, the index.
>

In the latest version of zoo index.column= can be a list.
index.column = list(1:2), which can be abbreviated to just
index.column = 1:2, would pass the first two columns to FUN as a
single argument consisting of a two column matrix whereas index.column
= list(1, 2) would pass them as separate arguments.  Using the latter:

Lines <- "date           time        value
1999-11-11 10:20:00  1.2222"

library(zoo)
library(chron)

# z <- read.zoo("myfile.dat", index = list(1, 2),  header = TRUE,

z <- read.zoo(textConnection(Lines), index = list(1, 2),  header = TRUE,
	FUN = function(date, time) as.chron(paste(date, time)))