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

2013 5 1
2 个回答
更新时间：2016 3 21
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0 个投票

Hey everyone,
I am running R2012b.
I type in: s = tf('s')
Undefined function 'tf' for input arguments of type 'char'.
can someone please help me?
Thanks so much!

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Kye Taylor
Kye Taylor 2013-5-1
What do you want to do with tf('s')... transfer function? What does tf represent?
Wafeeq
Wafeeq 2016-3-21
编辑：Wafeeq 2016-3-21
Do you have control Toolbox in matlab? You can write ver in matlab to check if it is available. Otherwise you can use tf if you dont have control toolbox

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回答（2 个）

0 个投票

tf is part of Control System Toolbox. The error message you are seeing means you do not have this product on your license. You can see which toolboxes you have by typing
ver
at the command line.

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Walter Roberson
Walter Roberson 2013-5-1
The Control Systems Toolbox is included with the Student Version license, but is not installed by default.

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Jan
Jan 2013-5-1

0 个投票

Asking Google or searching in the forum is a good strategy to get fast answers. See http://www.mathworks.com/matlabcentral/answers/65972.

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Lenin
Lenin
2013-5-1

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Wafeeq
Wafeeq
2016-3-21

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