rewrite the polynomial coefficients
显示 更早的评论
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 个评论
Star Strider
2015-3-29
Multiply the numerator and denominator by 1000.
John D'Errico
2015-3-29
编辑：John D'Errico
2015-3-29
More correctly, that would be 999.000999000999..., not 1000.
Star Strider
2015-3-29
I stand corrected!
采纳的回答
Radha Krishna Maddukuri
2015-4-7
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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