[R] how to use expression as function arguements?

[casperyc]

Hi all,

#####################################
integ=function(f,n){ 
	# computes vector y = f(x)
	x=runif(10000)
	y=f
	hatI=mean(y)
	hatI
}
# example of use
integ(x^2+x+100,100)
#####################################
it returns an error says no obj 'x'

how do I 'tell' R to treat 'f' as an input expression?

Thanks.

casper
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