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```
#' @title Claims problem data
#' @description The function returns to which of the following sub-domains the claims problem belongs to: the lower-half, higher-half, and midpoint domains. In addittion, the function returns
#' the minimal rights vector, the truncated claims vector, the sum and the half-sum of claims.
#' @param E The endowment.
#' @param d The vector of claims.
#' @param draw A logical value.
#' @return The minimal rights vector; the truncated claims vector; the sum, the half-sum of the claims, and the class (lower-half, higher-half, and midpoint domains) to which the claims problem belongs. It returns cod = 1 if the claims problem belong to the lower-half domain, cod = -1 if it belongs to the higher-half domain, and cod = 0 for the midpoint domain. Moreover, if draw = TRUE a plot of the claims, from small to large in the interval [0,D], is given.
#' @details Let \eqn{E\ge 0} be the endowment to be divided and \eqn{d\in \mathcal{R}^n}{d} the vector of claims
#' with \eqn{d\ge 0} and such that \eqn{D=\sum_{i=1}^{n} d_i\ge E}{D=\sum di \ge E}, the sum of claims \eqn{D} exceeds the endowment.
#'
#' The lower-half domain is the sub-domain of claims problems for which the endowment is less or equal than the half-sum of claims, \eqn{E \le D/2}.
#'
#' The higher-half domain is the sub-domain of claims problems for which the endowment is greater or equal than the half-sum of claims, \eqn{E \ge D/2}.
#'
#' The midpoint domain is the sub-domain of claims problems for which the endowment is equal to the half-sum of claims, \eqn{E = D/2}.
#'
#' The minimal right of claimant \eqn{i} in \eqn{(E,d)} is whatever is left after every other claimant has received his claim, or 0 if that is not possible:
#' \deqn{m_i(E,d)=\max\{0,E-d(N\backslash\{i\})\},\ i=1,\dots,n.}{mi = max\{ 0 , E-d(N-\{i\}) \}, i=1,\dots,n.}
#' Let \eqn{m(E,d)=(m_1(E,d),\dots,m_n(E,d))}{m(E,d)=(m1,\dots,mn)} be the vector of minimal rights.
#'
#' The truncated claim of claimant \eqn{i} in \eqn{(E,d)} is the minimum of the claim and the endowment:
#' \deqn{t_i(E,d)=\min\{d_i,E\},\ i=1,\dots,n.}{ti = min\{di,E\}, i=1,\dots,n.}
#' Let \eqn{t(E,d)=(t_1(E,d),\dots,t_n(E,d))}{t(E,d)=(t1,\dots,tn)} be the vector of truncated claims.
#'
#' @seealso \link{setofawards}, \link{allrules}
#' @examples
#' E=10
#' d=c(2,4,7,8)
#' problemdata(E,d,draw=TRUE)
#' @export
problemdata = function(E,d,draw=FALSE){
########################################
# Required: (E,d) must be a claims problem, i.e., E >=0, d >=0, E <= sum(d)
########################################
n= length(d); D=sum(d) #The number of claims and the total claim
if (E < 0 || sum((d < 0)) > 0 || E > D)
stop('(E,d) is not a claims problem.',call.=F)
###################
t = rep(0,n)
Dh = D/2
m = E-D+d #Minimal rights
m[m<0]=0
for(i in 1:n){#Truncated claims
t[i]=min(E,d[i]);
}
if(E<Dh){
cod=1
} else if(E>Dh){
cod=-1
} else {
cod=0
}
if (draw==TRUE){
#Graph with the claims on the ascending order.
dcrece=sort(d,index.return=T)$x
Ordencrece=sort(d,index.return=T)$ix
Dm=D-dcrece
inter=sort(c(0,dcrece,Dh,Dm,D))
plot(
0,
0,
type = "n",
xlim = c(0,D),
# ylim = c(-1,0),
main = c("Claims in ascending order on the interval [0,D]"),
xlab = paste("E=",as.character(E),"; d=[",toString(dcrece),"]",sep=""),
ylab = "",axes=F
)
lines(c(0,D),c(0,0),col="blue")
for(i in 1:length(inter)){
points(inter[i],0,pch=3)
text(inter[i],-0.15,toString(inter[i]),font=5)
}
text(0,-0.4,"0",font=3)
text(max(d),-0.4,"dn",font=3)
text(Dh,-0.4,"D/2",font=3)
text(min(Dm),-0.4,"D-n",font=3)
text(min(D),-0.4,"D",font=3)
points(E,0,pch=8,col="orange")
lines(c(E,E),c(0,0.3),col="orange")
text(E,0.4,"E",font=3,col="orange")
}
####
return(list(minimal_rights=m,truncated_claims=t,sum_claims=D,half_sum_claims=Dh,cod_domain=cod))
}
```

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