writing transfer functions in matlab

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aaa 2012-4-2

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评论： rupam mahapatra 2022-1-27

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Hi, I want to write a transfer function in matlab. I know we usually write in the following way

trans = tf([1 0 0], [1 0 1]);

This gives something as a function of 's'.

what if i wanted to write an equation that was a function of 's+x', where x is a constant. So instead of H(s), i want to write a function and evaluate at values of say H(s+5).

thanks

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rupam mahapatra 2022-1-27

Write a MATLAB program to determine the partial fraction expansion of a rational z-transform. Using this program

determine the partial-fraction expansion of G(z).

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Answer 1

Thomas 2012-4-2

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The documentation has good examples on how to write transfer functions:

http://www.mathworks.com/help/toolbox/control/ref/tf.html

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Thomas 2012-4-2

is this what you want:

trans=tf([1 5],[1])

trans =

s + 5

aaa 2012-4-2

thanks for your reply.

that is not quite what i am looking for. that method just gives H(s) still. I would like to implement something that is in the form of H(s+5)

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Answer 2

Arkadiy Turevskiy 2012-4-4

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Do you want to see the resulting expression as a function of (s+x), or do you just want to write an equation as function of (s+x)? If it is the latter you could do this:

>> arg=tf('s')+5

arg =

s + 5

Continuous-time transfer function.

>> h=1/(arg+3)

h =