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Close-loop TF Calculation

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Manuel Robles Villamarin
编辑： Walter Roberson 2021-2-21
Hello,
I am trying to do a close-loop TF Calculation but I get an error:
Gc=(32.8802(s+3)/s(s+7)(s+8.52))
Gc=(32.8802(s+3)/s(s+7)(s+8.52))
↑
Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise,
check for mismatched delimiters.
CAN YOU HELP TO UNDERSTAND WHAT IS GOING ON? THANK YOUUUUUU!!!

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回答（1 个）

David Wilson
David Wilson 2021-2-21
You need a few multiplies.
s = tf('s')
Gc= 32.8802*(s+3)/s/(s+7)/(s+8.52)
Now you can perform step or bode or whatever.

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