零极点增益模型:G(s) s3+1ls2+30s 》num=[1,11,30,0]; s4+9s3+45s2+87s+50 →》den=[1,9,45,87,50];[Zpk]=t2 zp(num, den) Z- 0 -3.0000+4.0000i 6 3.0000-4.0000i 5 -2.0000 1.0000 结果表达式:G(s)= s(S+6(S+5) (S+1)(S+2)(s+3+4j)s+3-4j)零极点增益模型： 》num=[1,11,30,0]; 》den=[1,9,45,87,50]; [z,p,k]=tf2zp(num,den) 》 9 45 87 50 11 30 ( ) 4 3 2 3 2 + + + + + + = s s s s s s s G s ( 1)( 2)( 3 4 )( 3 4 ) ( 6)( 5) ( ) s s s j s j s s s G s + + + + + − + + = z= 0 -6 -5 p= -3.0000+4.0000i -3.0000-4.0000i -2.0000 -1.0000 k= 1 结果表达式：