Adde dnone case to analyitic
@@ -1044,12 +1044,17 @@ class ETS(BaseETS):
elif analytic == "exp":
# TODO: move to SMTB.base, Horner form with skew(v)
gamma = trlog(t2r(T), twist=True)
+ elif analytic == None:
+ return J
else:
raise ValueError("bad analyical value specified")
A = angvelxform(gamma, representation=analytic)
J = A @ J
+ # A = angvelxform(t2r(T), inverse=True, representation=analytic)
+ # J = A @ J
+
return J
