You need to reread the help for [, specifically the drop argument.
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Sarah
On Fri, Jan 8, 2010 at 5:57 PM, Fahim <fahim...@gmail.com> 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
>
> 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?????????????/
>
>
--
Sarah Goslee
http://www.functionaldiversity.org
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