[R] populating an array

[Charles C. Berry]

On Wed, 14 Oct 2009, tdm wrote:

>
> Hi,
>
> Can someone please give me a pointer as to how I can set values of an array?


See

 	?Subscript

and study the examples.

What do you suppose

 	array( 1:4, dim=c(2, 2) )[1][2]

is? R is not C.

HTH,

Chuck



>
> Why does the code below not work?
>
> my_array <- array(dim=c(2,2))
> my_array[][] = 0
> my_array
>     [,1] [,2]
> [1,]    0    0
> [2,]    0    0
>
> for(i in seq(1,2,by=1)){
> for(j in seq(1,2,by=1)){
> my_array[i][j] = 5
> }
> }
>
> Warning messages:
> 1: In my_array[i][j] = 5 :
>  number of items to replace is not a multiple of replacement length
> 2: In my_array[i][j] = 5 :
>  number of items to replace is not a multiple of replacement length
>
> my_array
>     [,1] [,2]
> [1,]    5    0
> [2,]    5    0
>
>
>
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>
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Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901