[R] sub() of matrix returns a vector and not a matrix
Martin Maechler
maechler at stat.math.ethz.ch
Tue May 7 16:25:48 CEST 2002
>>>>> "Wolfram" == "Wolfram Fischer <- Z/I/M" <wolfram at fischer-zim.ch>> writes:
Wolfram> Is there a simple possibility to become directly a
Wolfram> matrix from a call of sub() on a matrix?
This can be considered as a feature proposal which I would
second:
sub() and gsub() could be enhanced such as to keep attributes(.)
of their x argument.
The `dim' attribute which makes a vector into a matrix is just
one kind of attributes.
Opinions?
>> a <- matrix( letters[1:6], 2, 3 )
>> b <- sub( '(.)', '-\\1-', a )
Wolfram> # I had expected b to be a matrix # but b is a vector
>> print( b )
Wolfram> [1] "-a-" "-b-" "-c-" "-d-" "-e-" "-f-"
>> dim(b) <- dim(a)
>> print( b )
Wolfram> # b is now a matrix again
....
Martin Maechler <maechler at stat.math.ethz.ch> http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO C16 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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