hi all, is someone kind enough to show me how to combine the following into one fraction in matlab?

example:
y=1/x + 1/x^2 + 1/x^3 + x/(1-x^2)
i need:
y=X1/X2 where X1 and X2 are function of x

 

Is it for a general purpose fraction or are you interested in Transfer Function transformations? For that purpose there is the zpk(tf) command.

If you are interested in general fractions, you can use "factor(syms)" to collect the terms in the nominator and denominator and then use "expand(syms)" to expand them manually.

Does that cover your needs?

 

this is for general fractions. The solution is for symbols created using tf(). Thanks for the thought!

 

The first solution is for transfer function lti objects only. The second paragraph does apply to your problem.

 

tried and worked

THANK YOU!

The first solution is for transfer function lti objects only. The second paragraph does apply to your problem.