rewrite the polynomial coefficients

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?

[Star Strider]

Multiply the numerator and denominator by 1000.

[John D'Errico]

More correctly, that would be 999.000999000999..., not 1000.

[Star Strider]

I stand corrected!

Answer 1

[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);

[Jimmy]

Wonderful thanks