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

Jose Quesada quesada at gmail.com
Mon May 7 20:25:06 CEST 2007


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.


Jose Quesada, PhD.

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