[R] matrix transpose

Wacek Kusnierczyk Waclaw.Marcin.Kusnierczyk at idi.ntnu.no
Sun Feb 15 21:29:06 CET 2009

Roger wrote:
> This is supposed to be an easy operation, but R 2.8.1 on Mac OS X gives me a
> lot trouble. the t() function simply does not work properly.  What I mean is
> it works sometimes but does not work at the most of the time, even with the
> same matrix.
> this is an example taken from R help
>> a <- matrix(1:30, 5,6)
>> t(a)
> Error in t(a) : unused argument(s) (1:30)
> It just gives this error.  If I restart my Mac (Yeah, have to restart the
> OS), then there are chances t() works, but sometimes it still does not work.

does it ever fail if you try the example in a fresh r session (i.e., one
without anything executed before this code)?

when it fails, what is t?  have you redefined t to be some other
function, in particular, a no-argument one, as here:

t = function() NULL

a = matrix(1:30, 5, 6)
# Error in t(a) : unused argument(s) (1:30)

this is most likely what happens here.


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