Why does c2d function not work on a system defined using transfer function approach in the Control System Toolbox 6.2.1 (R14SP3)?

2009 6 27
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When I use a transfer function as an input argument to c2d function, I get the following error:
analy=tf([1],[1 1])
[digit, M]=c2d(analy,0.1,'tustin')
gives the following error:
Transfer function:
1
-----
s + 1
??? Error using ==> tf.c2d
Too many output arguments.

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This enhancement has been incorporated in Release 2006b (R2006b). For previous product releases, read below for any possible workarounds:
The Control System Toolbox 6.2.1(R14SP3) documentation for the c2d function does not expliictly state the system format to be passed to this function.
The following syntax of this function:
[sysD, G]=c2d(sys, Tf, 'tustin')
assumes that 'sys' is a state-space model.

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