Hurwitz stability criterion

Gives Hurwitz determinant and logical respond for system stability.

Example for "tf" class:
>> s = tf('s');
>> W = 1/(s^4 + 2*s^3 + 3*s^2 + 4*s + 5);
>> [hwz,truefalse] = hurwitz(W,'tf')

Sistem je nestabilan.

hwz =

2 4 0 0
1 3 5 0
0 2 4 0
0 1 3 5

truefalse =

logical

0
Example for "sym" class:
>> syms s
>> W = 1/(s^2 + 2*s + 1);
>> [hwz,truefalse] = hurwitz(W,'sym')

Sistem je stabilan.

hwz =

2 0
1 1

truefalse =

logical

1