Nothing
sq <-
function(J,t=NULL){
# generate matrix
M = NULL
if(J>=1){
if(is.null(t)){ # se non viene dato t
if(J==1){
M = rbind(0,1)
}else{
TT = sq(J-1); nt = nrow(TT)
M = rbind(cbind(0,TT),cbind(1,TT));
}
}else{
if(t==J){ # se sono tutti elementi 1
M = matrix(1,1,J)
}else if(t>1){ # se sono sia 1 che 0
for(i in 1:(J-t+1)){
S = sq(J-i,t-1)
r = nrow(S)
TT = cbind(matrix(0,r,i-1),1,S)
M = rbind(TT,M)
}
}else if(t==1){
M = matrix(0,J,J)
for(j in 1:J) M[j,J-j+1] = 1
}else{
M = matrix(0,1,J) # se non ci sono elementi 1
}
}
}
# output
return(M)
}
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