Check_B <- function(B){
if(is.null(dim(B))){
if(!is.null(length(B))){
print(paste0("The argument Drift is not a matrix. It should be a matrix of size q times q."))
stop()
}else{
print(paste0("The argument Drift is not found: The lagged effects matrix Drift is unknown, but should be part of the input."))
stop()
}
}else if(length(dim(B)) < 2){
print(paste0("The lagged effects matrix Drift should be an q times q matrix."))
stop()
}else if(length(dim(B)) > 2){
print(paste0("The lagged effects matrix Drift should be an q times q matrix. Currently, it is of size ", dim(B)))
stop()
}else if(dim(B)[1] == 0 | dim(B)[2] == 0){
print(paste0("The lagged effects matrix Drift or Phi should be a square matrix of size q times q, with q > 0. Currently, it is of size ", dim(B)[1], " times ", dim(B)[2]))
stop()
}else if(dim(B)[1] != dim(B)[2]){
print(paste0("The lagged effects matrix Drift should be a square matrix of size q times q. Currently, it is of size ", dim(B)[1], " times ", dim(B)[2]))
stop()
}
}
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