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

Asked by Ben on 5 Mar 2013

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!



3 Answers

Answer by Honglei Chen on 5 Mar 2013

Do you have Control System Toolbox? What is the out put of the following command?

>> ver


Honglei Chen
Answer by Ben on 5 Mar 2013

>> ver -------------------------------------------------------------------------------------------------------- MATLAB Version: (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™ 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


Answer by Ben on 5 Mar 2013

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 Comment

Honglei Chen on 5 Mar 2013

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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