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8.0 Control Systems ToDiscreteTimeModel[]

• To: mathgroup at smc.vnet.net
• Subject: [mg114572] 8.0 Control Systems ToDiscreteTimeModel[]
• From: roby <roby.nowak at gmail.com>
• Date: Wed, 8 Dec 2010 06:40:58 -0500 (EST)

Dear all !

ToDiscreteTimeModel[TransferFunctionModel[1/s, s], Ts, z] // InputForm

behaves just like expected and returns:

TransferFunctionModel[{{{Ts*(1 + z)}}, {{2*(-1 + z)}}}, z,
SamplingPeriod -> Ts]


But:

ToDiscreteTimeModel[TransferFunctionModel[s, s], Ts, z] // InputForm

With the default Option Method->"BilinearTransform" I would expect
something like:

TransferFunctionModel[{{{2*(-1 + z)}}, {{Ts*(1 + z)}}}, z,
SamplingPeriod -> Ts]


but what is returned actualy seems to be some bug/crash:

TransferFunctionModel[{{{2*(-1 + z)}},
{{Control`ConversionsDump`sdmult$927}}}, z,
 SamplingPeriod -> Ts]


Any hints, am I missing something ?

Regards Robert