rewrite the polynomial coefficients

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Jimmy
Jimmy 2015-3-29
评论： Jimmy 2015-4-7
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?

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采纳的回答

Radha Krishna Maddukuri
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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