Re: [R] strange behavior of R
On Fri, Jan 8, 2010 at 10:57 PM, Fahim wrote: >> arr > [1] "y1" "y2" > At this moment 'arr' no longer has two dimensions, but only one. So you can access it only as a vector. > Problem: I want to access the first row now using: >>arr[1, ] > Error in arr[1, 1] : incorrect number of dimensions > Correct. It has only one dim. > Though it is showing the value as under: >> arr[1] > [1] "y1" > >> arr[2] > [1] "y2" > This is how you would access individual elements in vectors. Liviu __ R-help@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.
Re: [R] strange behavior of R
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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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] strange behavior of R
You need to reread the help for [, specifically the drop argument.
?"["
Sarah
On Fri, 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
>
> 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
__
R-help@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.
[R] strange behavior of R
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?/
-Fahim
--
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and provide commented, minimal, self-contained, reproducible code.
