Nothing
################################################################
###
### This is the main interface function for the FLSA
### it calls the right C++ function depending on whether it is a 2-dimensional
### or a 1-dimensional problem
###
################################################################
neariso = function(y, maxBreaks=100, lambda=NULL)
{
if(!is.vector(y)) {
stop("y has to be a vector")
}
solObj = .Call("NIR",as.numeric(y), PACKAGE="neariso")
if(is.null(lambda))
{
lambda <- nearisoGetBreakpoints(solObj, maxBreaks)
}
else {
### find the degrees of freedom for the lambdaVec
}
resExplicit = NIROneDimExplicitSolution(solObj,lambda)
res <-list(solObj=solObj, lambda=resExplicit$lambda, df=resExplicit$df, beta=resExplicit$beta)
class(res) <- "nearisoPath"
return(res)
}
#################################################################
###
### create a list of the breakpoints
### if there are more than 100, gives 100 evenly spaced over the
### whole region
###
#################################################################
nearisoGetBreakpoints <- function(nearisoPathObj, maxBreaks=100) {
if(class(nearisoPathObj) != "nearisoPath" && class(nearisoPathObj) != "nearisoSolObj") {
stop("nearisoPathObj is not of class nearisoPATH")
}
solObj <- NULL
if(class(nearisoPathObj) == "nearisoPath") {
solObj <- nearisoPathObj$solObj
}
else {
solObj <- nearisoPathObj
}
lambdaList <- sort(unique(solObj$mergeLambda), decreasing=FALSE)
if(lambdaList[1] == -1) {
lambdaList[1] <- 0
}
else {
lambdaList <- c(0, lambdaList)
}
if(length(lambdaList) > maxBreaks) {
selectIndex <- (0:(maxBreaks-1))/(maxBreaks-1) * (length(lambdaList)-1)
selectIndex <- round(selectIndex)
lambdaList <- lambdaList[selectIndex + 1]
}
return(lambdaList)
}
##################################################################
###
### if an object with the solution tree was returned, this object can
### be used to generate explicit solutions
###
##################################################################
nearisoGetSolution <- function(nearisoPathObj, lambda=nearisoGetBreakpoints(nearisoPathObj))
{
### check that lambda is ok
if(is.null(lambda)) {
stop("lambda has to be specified")
}
lambda = checkLambda(lambda)
if(class(nearisoPathObj)=="nearisoPath")
{
res = NIROneDimExplicitSolution(nearisoPathObj$solObj, lambda)
}
else
{
stop("nearisoPathObj is not of class nearisoPath")
}
nearisoPathObj$beta <- res$beta
nearisoPathObj$lambda <- res$lambda
nearisoPathObj$df <- res$df
return(nearisoPathObj)
}
##################################################################
###
### function that checks if lambda has the right format
###
##################################################################
checkLambda <- function(lambda)
{
### check that lambda is a numeric vector, increasing and only non-negative elements
if(!is.numeric(lambda))
{
stop("lambda has to be a numeric vector")
}
### make sure that lambda is non-negative
if(sum(lambda<0)>0)
{
stop("lambda has to be non-negative")
}
### sort lambda, make sure all are unique
lambda = sort(unique(lambda))
return(lambda)
}
####################################################################
###
### get an explicit solution from a FLSA solution object
### this is an internal function and will be hidden in the package
###
####################################################################
NIROneDimExplicitSolution <- function(solObj, lambda)
{
lambda = checkLambda(lambda)
lambdaAll <- nearisoGetBreakpoints(solObj, solObj$numVars + 1)
lambdaAll <- c(lambdaAll, 1e10)
degFree <- solObj$numVars + 1 - cut(lambda, lambdaAll, right=FALSE, labels=FALSE)
beta <- t(.Call("NIRexplicitSolution",solObj, lambda, PACKAGE="neariso"))
return(list(beta=beta, lambda=lambda, df=degFree))
}
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