Nothing
ifmkcca <-
function(xx, yy, zz, kernel="rbfdot",gamma=0.00001, ncomps=1, jth=1)
{
CMCOVKX <- rkcco(xx, yy, "square", kernel, gamma)
CMCOVKZ <- rkcco(xx, zz, "square", kernel, gamma)
CKX <- CMCOVKX$rkcmx
CKY <- CMCOVKX$rkcmy
CKZ <- CMCOVKZ$rkcmy
KXX <- CMCOVKX$rkcooxx
KYY <- CMCOVKX$rkcooyy
KZZ <- CMCOVKZ$rkcooyy
n <- dim(xx)[1]
W <- rep(1/n, n)
KXY <- tcrossprod(CKX%*%diag(W),CKY)
KXZ <- tcrossprod(CKX%*%diag(W),CKZ)
KYZ <- tcrossprod(CKY%*%diag(W),CKZ)
m <- 3
AB <- matrix(0, n * m, n * m)
CD <- AB
AB[0:n,0:n ] <- 0
AB[(n + 1):(2 * n),(n + 1):(2 * n) ] <-0
AB[(2 * n + 1):(3 * n),(2 * n + 1):(3 * n) ] <-0
AB[0:n,(n + 1):(2 * n)] <- (KXY)
AB[0:n,(2 * n + 1):(3 * n)] <- (KXZ)
AB[(n+1):(2 * n),(2 * n + 1):(3 * n)] <- (KYZ)
AB <- AB + t(AB)
CD[1:n, 1:n] <- (KXX+ diag(rep(1e-6,n)))
CD[(n + 1):(2 * n), (n + 1):(2 * n)] <- (KYY+ diag(rep(1e-6,n)))
CD[(2 * n + 1):(3 * n), (2 * n + 1):(3 * n)] <- (KZZ+ diag(rep(1e-6,n)))
CD <- (CD + t(CD))/2
ei <- gmedc(AB, CD)
kcor <- as.double(ei$gvalues[1:ncomps])
xcoef <- matrix(as.double(ei$gvectors[1:n, 1:ncomps]), n)
ycoef<- matrix(as.double(ei$gvectors[(n + 1):(2 * n), 1:ncomps]), n)
zcoef<- matrix(as.double(ei$gvectors[(2 * n + 1):(3 * n), 1:ncomps]), n)
CVX <- CKX%*%xcoef
CVY <- CKY%*%ycoef
CVZ <- CKZ%*%zcoef
IFcor <- abs(2*kcor*(CVX*CVY) + 2*kcor*(CVX*CVZ)+2*kcor*(CVZ*CVY)- kcor^2*(CVX^2) - kcor^2*(CVY^2)-kcor^2*(CVZ^2))[,jth]
return(list(ifmkcor=IFcor))
}
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