HELPPP!!! polynomial to transfer function?

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Alex
Alex 2011-5-6
Im am having trouble converting from a polynomial to a transfer function automatically. My matlab program computes a denominator for example x^2+2x+1, and a numerator say x^2+3x+2 (x is a symbol). Now i want the program to automatically make a transfer function from these polynomials. I tried collecting the coefficients like eq1=coeffs(x^2+2x+1) and eq2=coeffs(x^2+3x+2) and put these in tf(eq1,eq2) and i get an error. I found that if i copy paste the results like eq1=[1 2 1] and eq2=[1 3 2] i get what i want. I have really big polynomials to deal with and need the program to do it automatically. thanks for the help...

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Teja Muppirala
Teja Muppirala 2011-5-6
Here's an idea.
syms x
eq1 = x^2+2*x+1
eq2 = x^2+3*x+2
s = tf('s')
eq1_s = strrep(char(eq1),'x','s');
eq2_s = strrep(char(eq2),'x','s');
G = eval(eq1_s) / eval(eq2_s)
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Alex
Alex 2011-5-6
BOOOOOOOOOMMMMMMMM!!!! wowww i spent like 5 hours on this.
Thanks Teja

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