[R] numerics only

[Tony Plate]

Try:

 > x <- 
data.frame(a=factor(letters[1:3]),b=I(LETTERS[1:3]),c=as.integer(1:3),d=(1:3)/10)
 > sapply(x, is.numeric)
     a     b     c     d
FALSE FALSE  TRUE  TRUE
 > sapply(x, mode)
           a           b           c           d
   "numeric" "character"   "numeric"   "numeric"
 > sapply(x, storage.mode)
           a           b           c           d
   "integer" "character"   "integer"    "double"
 > sapply(x, class)
$a
[1] "factor"

$b
[1] "AsIs"

$c
NULL

$d
NULL

 > sapply(x, data.class)
         a         b         c         d
  "factor"    "AsIs" "numeric" "numeric"
 >


At 03:27 PM 11/11/2002 -0500, Blew, Ted wrote:
>is there a way to identify the *numeric* data elements (columns) in a
>data.frame that contains both numeric and character data elements?  thanks
>in advance, ted.
>
>----------------------------------------
>Ted Blew
>Educational Testing Service
>MS 22T
>Princeton NJ 08541
>tblew at ets.org
>609.734.5976 (office)
>
>
>
>
>**************************************************************************
>This e-mail and any files transmitted with it may contain privileged or
>confidential information. It is solely for use by the individual for whom
>it is intended, even if addressed incorrectly. If you received this e-mail
>in error, please notify the sender; do not disclose, copy, distribute, or
>take any action in reliance on the contents of this information; and delete
>it from your system. Any other use of this e-mail is prohibited. Thank you
>for your compliance.
>
>
>
>-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
>r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
>Send "info", "help", or "[un]subscribe"
>(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
>_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._ 
>

-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._