more on "[<-"

"[<-" in R 0.63 does not appear to strip attributes, whereas Splus and previous
versions of R did.

Paul
_____

R 0.63:

 data <- matrix(rnorm(300),100,3)
 attr(data, "tframe") <- c(1981.50, 2006.25 ,   4.00)
attributes(data)

$dim
[1] 100   3
$tframe
[1] 1981.50 2006.25    4.00

z <- data[10:90,]
attributes(z)

$dim
[1] 81  3
$tframe
[1] 1981.50 2006.25    4.00

Splus:

  data <- matrix(rnorm(300),100,3)
 attr(data, "tframe") <- c(1981.50, 2006.25 ,   4.00)
attributes(data)

$dim:
[1] 100   3
$tframe:
[1] 1981.50 2006.25    4.00

z <- data[10:90,]
attributes(z)

$dim:
[1] 81  3


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