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