[R] integrate (error: evaluation of function gave a result of wrong length)

[Dimitris.Kapetanakis]

Dear all,

I am trying to use the integrate function in R but it seems that it does not
work in my example and I cannot figure out why. I create a function Mu1
(which works fine) and try to integrate by the code:

n		<- 100
Ctrl	<- as.matrix(cbind(runif(n, -30, 30)))
W		<- Ctrl + as.matrix(rnorm(n))
Rsp		<- (W>as.matrix(sample(10, n, T)))*1

Mu1	<- function(x, Y=Rsp, Xc=Ctrl){
	x <- as.matrix(x)
	k <- dnorm((Xc-matrix(x, n, ncol(Xc), T)))
	K <- diag(apply(k, 1, function(c) prod(c)))
	delta <- solve(t(Xc)%*%K%*%Xc)%*%t(Xc)%*%K%*%Y
	delta[1]
}
Mu1(10)
integrate(Mu1, -30, 30)

then it posts me an error:

Error in integrate(Mu1, -30, 30) : 
  evaluation of function gave a result of wrong length
In addition: Warning message:
In matrix(x, n, ncol(Xc), T) :
  data length [21] is not a sub-multiple or multiple of the number of rows
[100]

Could you please tell me where is the error and how I could correct it?

Thanks a lot

Dimitris


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