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rewrite the polynomial coefficients

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Jimmy
Jimmy il 29 Mar 2015
Commentato: Jimmy il 7 Apr 2015
H =
1e-08 s
-------------------------------------------------
s^4 - 0.0002 s^3 - 3.002 s^2 + 2.001 s + 0.001001
i want the polynomial in the denominator to end with +1 instead of +0.001001. is there any easy way to do this with a function?
  3 Commenti
John D'Errico
John D'Errico il 29 Mar 2015
Modificato: John D'Errico il 29 Mar 2015
More correctly, that would be 999.000999000999..., not 1000.
Star Strider
Star Strider il 29 Mar 2015
I stand corrected!

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Risposta accettata

Radha Krishna Maddukuri
Radha Krishna Maddukuri il 7 Apr 2015
Hi Jimmy,
You have to divide the numerator and denominator by the last element in the denominator. The easiest way would be to get the last element using den(end). The end argument will give you the last element in the row irrespective of the length of the array.
>> num = [1e-8 0];
>> den = [1 -0.0002 -3.002 +2.001 +0.001001];
>> poly= tf(num,den);
>> den_new = den/den(end);
>> num_new = num/den(end);
>> poly_new = tf(num_new,den_new);

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