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From: Susan on 22 Apr 2010 16:29
I want to add 2 transfer function together in MATLAB.
OL_num1=[1];
OL_den1=[1 1 1];
sys1=tf(OL_num, OL_den);

OL_num2=[1];
OL_den2=[1 1 1];
sys2=tf(OL_num, OL_den);

Sum = sys1+sys2

I'm confused on MATLAB is doing, b/c adding 2 transfer functions should not change the numerators. How is MATLAB adding these?
From: ade77 on 22 Apr 2010 16:42
"Susan " <susanreneemueller(a)gmail.com> wrote in message <hqqbik$cg$1(a)fred.mathworks.com>...
> I want to add 2 transfer function together in MATLAB.
> OL_num1=[1];
> OL_den1=[1 1 1];
> sys1=tf(OL_num, OL_den);
>
> OL_num2=[1];
> OL_den2=[1 1 1];
> sys2=tf(OL_num, OL_den);
>
> Sum = sys1+sys2
>
> I'm confused on MATLAB is doing, b/c adding 2 transfer functions should not change the numerators. How is MATLAB adding these?

if you have control toolbox, check documentation for 'series', and 'parallel'
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