[R] Re place many rows in a table with new rows in one step

[David Winsemius]

On Oct 9, 2009, at 6:42 AM, Zhen Lin wrote:

>
> I tried this:
> (c is the column vector with indices of those rows I want to replace)
>
> table[c,]<-replace(table[c,],c,newRows)
>
> but it does not work and the error is:
> new columns would leave holes after existing columns

replace() is supposed to work on vectors, but if you have a table  
object then that might be better manipulated with indexing approaches.  
Try making up a small table object and they working on it.

 > table1 <- table(sample(LETTERS[1:5], 10, replace=T),  
sample(letters[1:5], 10, replace=T))
 > table1

     a b c d
   A 1 0 1 2
   B 0 1 0 0
   C 0 1 0 1
   D 0 0 0 1
   E 0 1 0 1
 > table1[2,] <- c(1,1,1,1)
 > table1

     a b c d
   A 1 0 1 2
   B 1 1 1 1
   C 0 1 0 1
   D 0 0 0 1
   E 0 1 0 1


-- 
David Winsemius, MD
Heritage Laboratories
West Hartford, CT