Nothing
################################
#### Simulation of random rotation matrices
#### Matrices in SO(p)
################################
rsop <- function(n, p) {
a <- c(1, numeric(p - 1) )
A <- array( dim = c(p, p, n) )
Ip <- diag(p)
for ( i in 1:n ) {
b <- rnorm(p)
b <- b / sqrt( sum(b^2) )
ca <- a - b * b[1]
ca <- ca / sqrt( sum(ca^2) )
B <- tcrossprod(b, ca)
B <- B - t(B)
theta <- acos( b[1] )
A[, , i] <- Ip + sin(theta) * B + ( cos(theta) - 1 ) * ( tcrossprod(b) + tcrossprod(ca) )
}
if (n == 1) A <- as.matrix( A[, , 1] )
A
}
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