I also tried:
m1 <- length(x)-1
X1<- cbind(x[1:m1],x1[2:length(x)])
X2<- cbind(x[1:m1],x1[2:length(x)])
integral <- function(rho){
m1 <- length(x1)-1
integral <- apply(X2,1,function(y)
apply(X1,1,function(x) pmvnorm(lower=c(y[1],x[1]), upper=c( y[2], x[2]),
corr=matrix(c(1,rho,rho,1),ncol=2))) )
return(integral)}
integral(0.5)
But it's even slower. I thougt apply function might improve speed, maybe I'm
using it wrong.
In the current status it would take weeks to calculate, because I have to
run it nearly 500.000 thousand times.
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