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sparsel1pca <- function (X, projDim=1, center=TRUE, projections="none", lambda=0)
{
if (!inherits(X, "matrix")) {
if (inherits(X, "data.frame"))
X <- as.matrix(X)
else
X <- matrix(X, ncol = 1)
}
if(center){
X <- apply(X,2,function(y) y - median(y));
}
X <- t(X)
pcLength <- nrow(X) * projDim
scoreLength <- 0
projLength <- 0
objLength <- 0
if (projections != "none") {
scoreLength <- projDim * ncol(X)
}
if (projections != "none") {
projLength <- nrow(X) * ncol(X)
}
# sol <- .C ("sparsel1pca", as.double(X), as.integer(dim(X)), as.integer(projDim), as.integer(scores), loadings=double(pcLength), scores=double(scoreLength), objectives=double(projDim), PACKAGE="pcaL1")
if ((lambda < 0) & (ncol(X) > 100)){
stop("Too many rows to calculate all lambdas. Specify a particular lambda.")
} else if (lambda < 0) {
pcLength <- 1000*ncol(X)
lambdas_out <- rep(-1,1000)
} else {
pcLength <- nrow(X) * projDim
lambdas_out <- c(lambda,0)
}
sol <- .C (C_sparsel1pca, as.double(X), as.integer(dim(X)), as.integer(projDim), loadings=double(pcLength), objectives=double(projDim), lambdas_out=as.double(lambdas_out), PACKAGE="pcaL1")
solution <- new.env()
solution$loadings <- matrix(sol[["loadings"]], ncol=projDim, byrow=FALSE)
solution$minobjectives <- sol[["objectives"]]
if (projections == "l1") {
myl1projection <- l1projection(t(X), as.matrix(solution$loadings[,1:projDim]))
solution$projPoints <- myl1projection$projPoints
#solution$projPoints <- as.matrix(t((solution$loadings) %*% t(solution$loadings) %*% X))
row.names(solution$projPoints) <- colnames(X)
#solution$scores <- matrix(sol[["scores"]], ncol=projDim, byrow=FALSE)
solution$scores <- myl1projection$scores
rownames(solution$scores) <- colnames(X)
totalDisp <- sum(abs(X))
scoreDisp <- apply(abs(solution$scores), 2, sum)
solution$dispExp <- scoreDisp/totalDisp
} else if (projections == "l2") {
myl2projection <- l2projection(t(X), as.matrix(solution$loadings[,1:projDim]))
solution$projPoints <- myl2projection$projPoints
#solution$projPoints <- as.matrix(t((solution$loadings) %*% t(solution$loadings) %*% X))
row.names(solution$projPoints) <- colnames(X)
#solution$scores <- matrix(sol[["scores"]], ncol=projDim, byrow=FALSE)
solution$scores <- myl2projection$scores
rownames(solution$scores) <- colnames(X)
totalDisp <- sum(apply(t(X),2, var))
scoreDisp <- apply(solution$scores, 2, var)
solution$dispExp <- scoreDisp/totalDisp
}
if (lambda < 0) {
num_lambdas <- length(lambdas_out)
solution$loadings <- matrix(sol[["loadings"]][1:(num_lambdas*nrow(X))], ncol=num_lambdas, byrow=FALSE)
solution$lambdas <- sol[["lambdas_out"]][1:num_lambdas]
solution$loadings <- solution$loadings[,order(solution$lambdas)]
solution$lambdas <- sort(solution$lambdas)
solution$lambdas <- solution$lambdas[!duplicated(solution$loadings, MARGIN=2)]
solution$loadings <- unique(solution$loadings, MARGIN=2)
} else{
solution$loadings <- matrix(sol[["loadings"]], ncol=projDim, byrow=FALSE)
solution$minobjectives <- sol[["objectives"]]
}
solution <- as.list(solution)
class(solution) <- "sparsel1pca"
solution
}
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