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# StateSpaceModel: new bug in 10.2

Posted 9 years ago
 I don't know if this is a bug, or if just something changed I can't figure out. Take the following examples: sysEq = y'''[t] == -1/T2^2 y'[t] - T1/T2^2 y''[t] + Ki/T2^2 u[t]; sysEq1 = y[t] == Kp u[t]; sysEq2 = y'[t] + (T1 + T2) y''[t] + T1 T2 y'''[t] == Ki u[t]; sysEq3 = Tn y'[t] == Kp u[t] + Kp Tn u'[t]; sysEq4 = y'[t] + T1 y''[t] + T2 y'''[t] == Kp u[t]; sysEq5 = Tn y'[t] + T1 Tn y''[t] + T2^2 Tn y'''[t] == Kp u[t] + Kp Tn u'[t]; sysEq6 = Tn y'[t] + T1 Tn y''[t] + T2^2 Tn y'''[t] == Kp u[t - Tt] + Kp Tn u'[t - Tt]; sysEq7 = y'[ t] + (T1 + T2 + T3) y''[t] + (T1 T2 + T1 T3 + T2 T3) y'''[t] + T1 T2 T3 y''''[t] == Ki u[t - Tt - Tt2] + Kp u'[t - Tt - Tt2]; allExamples = {sysEq, sysEq1, sysEq2, sysEq3, sysEq4, sysEq5, sysEq6, sysEq7};  In v10.0 all examples work: FullSimplify@TransferFunctionModel[ StateSpaceModel[#, {{y[t], 0}}, {{u[t], 0}}, {y[t]}, t] ] & /@ allExamples  But not in v10.2, example 6 and 7 won't give a proper result. Can somone confirm this, or show me where StateSpaceModel has changed so it doesn't work for this examples? Attachments: