[R] Appending elements to an array

2003-06-09 Thread Jonck van der Kogel 
Hi all,
I am having a bit of trouble with the array structure of R. What I want 
to do is dynamically add/remove elements to an array. For example:
Let's say I have created an array:
 myArray - array(c(3,8), dim=c(1,2))
 myArray
 [,1] [,2]
[1,]38

And I now want to, for example, push an element (5,6) on to this array 
so it will read:
 [,1] [,2]
[1,]38
[2,]56

And then pop the first element of the array so the array now reads:
 [,1] [,2]
[1,]56
How would I do this? So far I've only read how to create an array if 
you know the dimensions beforehand, but I've been unable to find how to 
dynamically add/remove elements to/from an array.

I've figured out how to do this with lists and vectors, but not with 
arrays. For this particular structure I need to work with arrays.

Any help on how to do something like this would be much appreciated.
Thanks, Jonck
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Re: [R] Appending elements to an array

2003-06-09 Thread Thomas Lumley 
On Mon, 9 Jun 2003, Jonck van der Kogel wrote:

 Hi all,
 I am having a bit of trouble with the array structure of R. What I want
 to do is dynamically add/remove elements to an array. For example:
 Let's say I have created an array:
   myArray - array(c(3,8), dim=c(1,2))
   myArray
   [,1] [,2]
 [1,]38

 And I now want to, for example, push an element (5,6) on to this array
 so it will read:
   [,1] [,2]
 [1,]38
 [2,]56

 And then pop the first element of the array so the array now reads:
   [,1] [,2]
 [1,]56

 How would I do this? So far I've only read how to create an array if
 you know the dimensions beforehand, but I've been unable to find how to
 dynamically add/remove elements to/from an array.

 I've figured out how to do this with lists and vectors, but not with
 arrays. For this particular structure I need to work with arrays.



myArray - array(c(3,8), dim=c(1,2))

#add to the bottom
myArray - cbind(myArray, c(5,6))

# display the top
myArray
# remove the top
myArray - myArray[-1,]


-thomas

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