Hi,
I am trying to write a method for [,data.frame,expression. But it give the
error:
*
*
*Error in xj[i] : invalid subscript type 'expression'*
I looked at the help files and the archives. No avail. Any ideas? Here is
an example that reproduces the error.
> setGeneric( '[' )
[1] "["
> setMethod( '[', c( 'data.frame', 'expression', 'ANY', 'ANY' ),
+ function(x, i, j, ..., drop ) { 1 }
+ )
[1] "["
> iris[ expression(1), ]
Error in xj[i] : invalid subscript type 'expression'
This is running R-2.11.1 on Windows and Linux.
Thanks in Advance,
Chris
Open Data
http://www.opendatagroup.com
http://opendatagroup.com/category/blog
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