Try:

apply(x, 2, prod)

-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22"
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On 07/05/07, Jose Quesada <quesada@gmail.com> 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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> and provide commented, minimal, self-contained, reproducible code.
>

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