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#' Hazard function.
#'
#' Let t be a continuous variable, we determine the value of the hazard
#' function to t after run fit.
#'
#'
#' @usage hazard(t, ObjFrailty)
#' @param t time for hazard function.
#' @param ObjFrailty an object from the frailtypack fit.
#' @return return the value of hazard function in t.
#' @export
#' @examples
#'
#'
#' \dontrun{
#'
#' #-- a fit Shared
#' data(readmission)
#' fit.shared <- frailtyPenal(Surv(time,event)~dukes+cluster(id)+
#' strata(sex),n.knots=10,kappa=c(10000,10000),data=readmission)
#'
#' #-- calling survival
#' hazard(20,fit.shared)
#'
#' }
#'
#'
"hazard" <- function(t,ObjFrailty){
if (ObjFrailty$typeof == 0){
nz <- ObjFrailty$n.knots
the <- ObjFrailty$b[1:(nz+2)] * ObjFrailty$b[1:(nz+2)]
zi <- ObjFrailty$zi
res <- NULL
if(inherits(ObjFrailty, "jointPenal")){
nst <- ObjFrailty$n.strat + 1 # deces
if((ObjFrailty$xR[,1] > t) || ((max(ObjFrailty$xR[,1])+0.00001) <= t)) stop(" Time exceeds the range allowed ")
if(ObjFrailty$n.strat > 1){
for (i in 2:ObjFrailty$n.strat){
if((ObjFrailty$xR[,i] > t) || (max(ObjFrailty$xR[,i]+0.00001) < t)) stop(" Time exceeds the range allowed ")
b <- ObjFrailty$b[((i-1)*(nz+2)+1):(i*(nz+2))]
the <- cbind(the,b*b)
}
}
if((ObjFrailty$xD > t) || (max(ObjFrailty$xD) < t)) stop(" Time exceeds the range allowed ")
b <- ObjFrailty$b[((nst-1)*(nz+2)+1):(nst*(nz+2))]
the <- cbind(the,b*b)
}else{
nst <- ObjFrailty$n.strat
if((ObjFrailty$x[,1] > t) || ((max(ObjFrailty$x[,1])+0.00001) <= t)) stop(" Time exceeds the range allowed ")
if(ObjFrailty$n.strat > 1){
for (i in 2:ObjFrailty$n.strat){
if((ObjFrailty$x[,i] > t) || (max(ObjFrailty$x[,i]) < t)) stop(" Time exceeds the range allowed ")
b <- ObjFrailty$b[((i-1)*(nz+2)+1):(i*(nz+2))]
the <- cbind(the,b*b)
}
}
}
out <- .Fortran(C_risque2,as.double(t),as.double(the),as.integer(nz+2),
as.double(zi),risque=as.double(rep(0,nst)),as.integer(nst)) #,PACKAGE = "frailtypack")
if(inherits(ObjFrailty, "jointPenal")){
res <- c(res,out$risque)
}else{
res <- out$risque
}
return(res)
}
if (ObjFrailty$typeof == 1){
res <- NULL
if(inherits(ObjFrailty, "jointPenal")){
if((ObjFrailty$xR[,1] > t) || (max(ObjFrailty$xR[,1]) < t)) stop(" Time exceeds the range allowed ")
x1 <- matrix(ObjFrailty$xR[,1],nrow=3,ncol=ObjFrailty$nbintervR)
x1 <- rbind(x1,rep(t,ObjFrailty$nbintervR))
ind <- apply(x1,MARGIN=2, FUN=function(x){which((x[1] <= x[4]) & (x[4] < x[3]))})
res <- c(res,ObjFrailty$lamR[(which(ind==1)*3-1),1,1])
if(ObjFrailty$n.strat > 1){
for (i in 2:ObjFrailty$n.strat){
if((ObjFrailty$xR[,i] > t) || (max(ObjFrailty$xR[,i]) < t)) stop(" Time exceeds the range allowed ")
x1 <- matrix(ObjFrailty$xR[,i],nrow=3,ncol=ObjFrailty$nbintervR)
x1 <- rbind(x1,rep(t,ObjFrailty$nbintervR))
ind <- apply(x1,MARGIN=2, FUN=function(x){which((x[1] <= x[4]) & (x[4] < x[3]))})
res <- c(res,ObjFrailty$lamR[(which(ind==1)*3-1),1,i])
}
}
if((ObjFrailty$xD > t) || (max(ObjFrailty$xD) < t)) stop(" Time exceeds the range allowed ")
x2 <- matrix(ObjFrailty$xD,nrow=3,ncol=ObjFrailty$nbintervDC)
x2 <- rbind(x2,rep(t,ObjFrailty$nbintervDC))
ind <- apply(x2,MARGIN=2, FUN=function(x){which((x[1] <= x[4]) & (x[4] < x[3]))})
res <- c(res,ObjFrailty$lamD[(which(ind==1)*3-1),1])
}else{
# shared additive nested
if((ObjFrailty$x[,1] > t) || (max(ObjFrailty$x[,1]) < t)) stop(" Time exceeds the range allowed ")
x1 <- matrix(ObjFrailty$x[,1],nrow=3,ncol=ObjFrailty$nbintervR)
x1 <- rbind(x1,rep(t,ObjFrailty$nbintervR))
ind <- apply(x1,MARGIN=2, FUN=function(x){which((x[1] <= x[4]) & (x[4] < x[3]))})
res <- c(res,ObjFrailty$lam[(which(ind==1)*3-1),1,1])
if(ObjFrailty$n.strat > 1){
for (i in 2:ObjFrailty$n.strat){
if((ObjFrailty$x[,i] > t) || (max(ObjFrailty$x[,i]) < t)) stop(" Time exceeds the range allowed ")
x1 <- matrix(ObjFrailty$x[,i],nrow=3,ncol=ObjFrailty$nbintervR)
x1 <- rbind(x1,rep(t,ObjFrailty$nbintervR))
ind <- apply(x1,MARGIN=2, FUN=function(x){which((x[1] <= x[4]) & (x[4] < x[3]))})
res <- c(res,ObjFrailty$lam[(which(ind==1)*3-1),1,i])
}
}
}
return(res)
}
if (ObjFrailty$typeof == 2){
if(!t)stop(" Use only for time greater than 0")
res <- NULL
if(inherits(ObjFrailty, "jointPenal")){
nst <- ObjFrailty$n.strat + 1 # deces
if((ObjFrailty$xR[,1] > t) || (max(ObjFrailty$xR[,1]) < t)) stop(" Time exceeds the range allowed ")
sc1 <- ObjFrailty$scale.weib[1]
sh1 <- ObjFrailty$shape.weib[1]
res <- c(res,(sh1*(t^(sh1-1)))/(sc1^sh1))
if(ObjFrailty$n.strat > 1){
for (i in 2:ObjFrailty$n.strat){
if((ObjFrailty$xR[,i] > t) || (max(ObjFrailty$xR[,i]) < t)) stop(" Time exceeds the range allowed ")
sc1 <- ObjFrailty$scale.weib[i]
sh1 <- ObjFrailty$shape.weib[i]
res <- c(res,(sh1*(t^(sh1-1)))/(sc1^sh1))
}
}
if((ObjFrailty$xD > t) || (max(ObjFrailty$xD) < t)) stop(" Time exceeds the range allowed ")
sc1 <- ObjFrailty$scale.weib[nst]
sh1 <- ObjFrailty$shape.weib[nst]
res <- c(res,(sh1*(t^(sh1-1)))/(sc1^sh1))
}else{
if((ObjFrailty$x[,1] > t) || (max(ObjFrailty$x[,1]) < t)) stop(" Time exceeds the range allowed ")
sc1 <- ObjFrailty$scale.weib[1]
sh1 <- ObjFrailty$shape.weib[1]
res <- c(res,(sh1*(t^(sh1-1)))/(sc1^sh1))
if(ObjFrailty$n.strat > 1){
for (i in 2:ObjFrailty$n.strat){
if((ObjFrailty$x[,i] > t) || (max(ObjFrailty$x[,i]) < t)) stop(" Time exceeds the range allowed ")
sc1 <- ObjFrailty$scale.weib[i]
sh1 <- ObjFrailty$shape.weib[i]
res <- c(res,(sh1*(t^(sh1-1)))/(sc1^sh1))
}
}
}
return(res)
}
}
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