[R] like apply(x,1,sum), but using multiplication?

[Benilton Carvalho]

see

?prod

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On May 7, 2007, at 2:25 PM, Jose Quesada wrote:

> Hi,
>
> I need to multiply all columns in a matrix so something like
> apply(x,2,sum), but using multiplication should do.
> I have tried apply(x,2,"*")
> I know this must be trivial, but I get:
> Error in FUN(newX[, i], ...) : invalid unary operator
>
> The help for apply states that unary operators must be quoted. I tried
> single quotes too, with the same results.
>
> Thanks,
> -Jose
>
> --  
> Jose Quesada, PhD.
> http://www.andrew.cmu.edu/~jquesada
>
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