C2d Bode plot 2 discrete models

I have an analog sys such that I have both the A&D forms (used c2d). Fine. I just wish to add a (manual) discrete variant (I have num,den of transfer function), to compare the (3) Bodes. When I enter the variant, it interprets it as analog, is there a way to tell it is is digital ?

In addition to num and den you also have to provide the sampling time to tf (), i.e.
tf (num,den,tsam)

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Thank you !