Undefined function 'tf' for input arguments of type 'char'.

19 次查看（过去 30 天）
Ben
Ben 2013-3-5
编辑： Walter Roberson 2015-5-16
Hey everyone,
so I need to do some aerospace homework. I am running R2012b.
I type in: s = tf('s')
just like my prof. says to and just like the help file says to
and i get the error:
Undefined function 'tf' for input arguments of type 'char'.
can someone please help me?!??!
Thanks so much!

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回答（3 个）

Honglei Chen
Honglei Chen 2013-3-5
Do you have Control System Toolbox? What is the out put of the following command?
>> ver
Ben
Ben 2013-3-5
Thank you Honglei for responding btw,
i'm guessing that this means I do not have the Control System Toolbox
how do i go about getting that??
  1 个评论
Honglei Chen
Honglei Chen 2013-3-5
I guess you'll have to talk to the system administrator in your department. Maybe you can talk to your professor first and then ask your professor to handle it. I assume this is going to be an issue for all students in the class.

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Ben
Ben 2013-3-5
编辑：Walter Roberson 2015-5-16
>> ver
--------------------------------------------------------------------------------------------------------
MATLAB Version: 8.0.0.783 (R2012b)
MATLAB License Number: ••••••
Operating System: Mac OS X Version: 10.8.2 Build: 12C3103
Java Version: Java 1.6.0_41-b02-445-11M4107 with Apple Inc. Java HotSpot(TM) 64-Bit Server VM mixed mode
--------------------------------------------------------------------------------------------------------
MATLAB Version 8.0 (R2012b)
Simulink Version 8.0 (R2012b)
Bioinformatics Toolbox Version 4.2 (R2012b)
Curve Fitting Toolbox Version 3.3 (R2012b)
Database Toolbox Version 4.0 (R2012b)
Datafeed Toolbox Version 4.4 (R2012b)
Econometrics Toolbox Version 2.2 (R2012b)
Financial Instruments Toolbox Version 1.0 (R2012b)
Financial Toolbox Version 5.0 (R2012b)
Fuzzy Logic Toolbox Version 2.2.16 (R2012b)
Global Optimization Toolbox Version 3.2.2 (R2012b)
Image Acquisition Toolbox Version 4.4 (R2012b)
Image Processing Toolbox Version 8.1 (R2012b)
Instrument Control Toolbox Version 3.2 (R2012b)
MATLAB Compiler Version 4.18 (R2012b)
Mapping Toolbox Version 3.6 (R2012b)
Neural Network Toolbox Version 8.0 (R2012b)
Optimization Toolbox Version 6.2.1 (R2012b)
Parallel Computing Toolbox Version 6.1 (R2012b)
Partial Differential Equation Toolbox Version 1.1 (R2012b)
Signal Processing Toolbox Version 6.18 (R2012b)
SimMechanics Version 4.1 (R2012b)
Simscape Version 3.8 (R2012b)
Simulink 3D Animation Version 6.2 (R2012b)
Stateflow Version 8.0 (R2012b)
Statistics Toolbox Version 8.1 (R2012b)
Symbolic Math Toolbox Version 5.9 (R2012b)
System Identification Toolbox Version 8.1 (R2012b)
Wavelet Toolbox

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