Why do I get this error?

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Luis
Luis 2012-12-12
Any idea of why do I get this error?
>> num = 1
num =
1
>> denom = [1 2 3]
denom =
1 2 3
>> sys = tf(num,denom)
sys =
1
-------------
s^2 + 2 s + 3
Continuous-time transfer function.
>> bandwidth(sys) Error using DynamicSystem/bandwidth (line 33) The "bandwidth" command cannot be used for models of class "tf".

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回答（1 个）

Babak
Babak 2012-12-12
Just worked on my computer.. here's your result:
>> bandwidth(sys)
ans =
2.0385
My ver command gives this:
>> ver
------------------------------------------------------------------------------------------------
MATLAB Version: 8.0.0.783 (R2012b)
MATLAB License Number: ******
Operating System: Microsoft Windows 7 Version 6.1 (Build 7601: Service Pack 1)
Java Version: Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode
------------------------------------------------------------------------------------------------
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Arthur
Arthur 2012-12-12
It worked here too.
Version 7.12.0.635(R2011a) 64-bit (win64)
Lucy
Lucy 2013-2-12
I have MATLAB Version: 7.14.0.739 (R2012a) on my school campus computers, neither:
bandwidth(sys) (where sys is a tf) or syss=ss(sys)
will work...
Is there something I'm missing or is this an outdated version problem?

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