val(x)# S4 method for madness
val(x)
# S4 method for madness
dim(x)
# S4 method for madness
length(x)
dvdx(x)
# S4 method for madness
dvdx(x)
xtag(x)
# S4 method for madness
xtag(x)
vtag(x)
# S4 method for madness
vtag(x)
varx(x)
# S4 method for madness
varx(x)