Nothing
dsespc <- function(y, mu, theta, logden = FALSE) {
the1 <- theta[1]
the2 <- theta[2]
if ( the1 == 0 & the2 == 0 ) {
a <- as.vector( y %*% mu )
rl <- sum(mu^2)
d <- rl + 1 - a^2
sqd <- sqrt(d)
up <- log( (rl + 1) * sqd * ( atan2(sqd, -a) - atan2(sqd, a) + pi ) + 2 * a * d )
down <- log(d^2)
den <- up - down - log(4 * pi^2)
if ( !logden ) den <- exp(den)
} else {
heta <- sqrt(the1^2 + the2^2 + 1) - 1
m0 <- sqrt(mu[2]^2 + mu[3]^2)
rl <- sum(mu^2) ## gamma^2
x1b <- c( -m0^2, mu[1] * mu[2], mu[1] * mu[3] ) / ( m0 * sqrt(rl) )
x2b <- c(0, -mu[3], mu[2])/m0
T1 <- tcrossprod(x1b)
T2 <- tcrossprod(x2b)
T12 <- tcrossprod(x1b, x2b)
vinv <- diag(3) + the1 * (T1 - T2) + the2 * ( T12 + t(T12) ) +
heta * (T1 + T2)
a <- as.vector( y %*% mu )
b <- Rfast::rowsums( y %*% vinv * y )
E <- b * rl + b - a^2
sqe <- sqrt(E)
up <- log( b * (rl + 1) * sqe * ( atan2(sqe, -a) - atan2(sqe, a) + pi ) + 2 * a * E )
down <- log( b * E^2 )
den <- up - down - log(4 * pi^2)
if ( !logden ) den <- exp(den)
}
den
}
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