On Jan 8, 2010, at 5:57 PM, Fahim wrote:
Hi
I observed an interesting behavior of R. Can you find where is the
bug, or
it is not a bug but made deliberately.
- Hide quoted text -
arr = c(); #defined the empty array
a= c("x1", "x2");
b = c("y1", "y2");
arr = rbind(arr,a); #row bind the first character array -a
arr = rbind(arr,b); # row bind the second character
array-b
Everything ok upto this point, arr content is displayed as follows
arr
[,1] [,2]
a "x1" "x2"
b "y1" "y2"
Now I delete any row:
arr = arr[-1,];
The value of arr is :
arr
[1] "y1" "y2"
Problem: I want to access the first row now using:
arr[1, ]
Error in arr[1, 1] : incorrect number of dimensions
use arr[ , -1, drop=FALSE] to avoid loosing dimensions.
?"["
--
David.
Though it is showing the value as under:
arr[1]
[1] "y1"
arr[2]
[1] "y2"
I think, when there is single row, R is considering it as an array
and not
as matrix. But why it is so?????????????/
Because you didn't red the manual.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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