hi.I don't know how to create B...help me pls.

     1           a        
A= -----  ; B= -----
   s + 2        s+b
1/ create tranfer function A and B
2/ A+B=?

[Star Strider]

Context:

Hi. I want creat a tranfer function have parameter,but i don't know how to do it.help me pls (link).

Either the statement or understanding of this homework assignment have significant problems.

[Image Analyst]

I don't know about 1, but wouldn't 2 simply by 1/(s+2)+a/(s+b)?

[Star Strider]

The problem is that OP wants to use the parameters ‘a’ and ‘b’ in functions that allow only numeric arguments. I went through every possibility I could think of in my Answer to the ‘Context’ Question, and none were acceptable.

Some Questions have no Answers. These are two of them.

NOTE — OP is using MATLAB Version 6.5.x.

[super bad]

a, b can replace by any numbers..this is my test

[super bad]

I do not see any way in my document. But that's the test that my teacher made... I find it so absurd.

[Star Strider]

In my Answer to your previous Question, in which I supplied anonymous and inline functions, amongst other approaches, that allow you to pass those parameters as arguments to the tf function, you said that none of them worked, yet those are the only possible options.

[super bad]

I tried your ways but the result was not a tranfer function. Perhaps because of our differences in language, I can not express exactly what I want for you.

Answer 1

[M]

Hello,

to create transfer functions in Matlab, you should look at the 'tf' function :

sys = tf(Numerator,Denominator)

transfer function

[super bad]

hello. I know use a command 'tf'.but it is only executed to numberic data.

ex: A=tf([1 1],[1 1 1]);

you can't use it for parameters (a,b) like my example.