R help - Jul 2011 - Coercing Logical array to Numeric array

Dear all,

Coercing a logical vector to a numeric one is easy. The as.numeric function is
used. However what do we use when we have a matrix or an array?

Sumona

On 20/07/2011 7:14 AM, Mitra, Sumona wrote:
> Dear all,
>
> Coercing a logical vector to a numeric one is easy. The as.numeric function
is used. However what do we use when we have a matrix or an array?
Usually you don't need to do anything:  if a local is used in 
arithmetic, the values are automatically coerced.  But if you really 
need the conversion, this should work:

newArray <- as.numeric(oldArray)
dim(newArray) <- dim(oldArray)

Duncan Murdoch

On Jul 20, 2011, at 7:14 AM, Mitra, Sumona wrote:
> Dear all,
>
> Coercing a logical vector to a numeric one is easy. The as.numeric  
> function is used. However what do we use when we have a matrix or an  
> array?
Here's one way:

 > m <-matrix(c("1", "2", "3",
"4"),2)
 > m
      [,1] [,2]
[1,] "1"  "3"
[2,] "2"  "4"
 > mode(m) <- "numeric"
 > m
      [,1] [,2]
[1,]    1    3
[2,]    2    4

>
> Sumona
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David Winsemius, MD
West Hartford, CT

Dear all,

Thank you so much for your help.

Best,
Sumona