On 12/02/2010 09:35 PM, Jinsong Zhao wrote:
Hi there,
In function, it's usually using ``='' to assign default value for function
argument. For newbie, it's possible to using ``<- '' to assign value for
function argument. Although it's not a correct way, R don't give any warning
message.
> matrix(1:20, ncol <- 4)
[,1] [,2] [,3] [,4] [,5]
[1,] 1 5 9 13 17
[2,] 2 6 10 14 18
[3,] 3 7 11 15 19
[4,] 4 8 12 16 20
It seems that R ignore the ``ncol <-'' and assign the value 4 to ``nrow''.
Would anyone here give a more detailed explanation about this? Thanks in
advance!
Yes, R gives the global variable ncol a value of 4. Try typing
> ncol
before and after your example.
The second argument to the matrix function is now the value 4, and R uses
positional matching to give that argument (nrow) a value of 4. Thus,
the result.
Moral of the story: don't do that. :)
--Erik
Best regards,
Jinsong
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