Info
programa\MATLAB\R2007b\work.
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>> A=[-10000 20000; -1 -2]
A =
-10000 20000
-1 -2
>> B=[0; 1E-4]
B =
1.0e-004 *
01.0000
>> B=[0; 1e-4]
B =
1.0e-004 *
0
1.0000
>> C=[0 20000]
C =
0 20000
>> D=[0]
D =
0>> GS=c*(S*I-A)^(-1)*B+D
??? Undefined function or variable 'c'.
>> S=sym('s')
S =
s
>> G=c*inv(s*eye(2)-A)*B+D
??? Undefined function orvariable 'c'.
>> G=c*inv(S*eye(2)-A)*B+D
??? Undefined function or variable 'c'.
>> G=C*inv(s*eye(2)-A)*B+D
??? Undefined function or variable 's'.
>> c
???Undefined function or variable 'c'.
>> C
C =
0 20000
>> a
??? Undefined function or variable 'a'.
>> C
C =
020000
>> G=C*inv(s*eye(2)-A)*B+D
??? Undefined function or variable 's'.
>> S=sym('s')
S =
s
>> S=sym('s')
S =
s
>> s=sym('s')
s =s
>> G=C*inv(s*eye(2)-A)*B+D
G =
2*(s+10000)/(s^2+10002*s+40000)
>> [N,D]=ss2tf(A,B,C,D)
N =
0 2 20000
D=
1 10002 40000
>> s=sym('s')
s =
s
>> root(D)
??? Undefined function or method 'root' for input arguments of type'double'.
>> roots(D)
ans =
1.0e+003 *
-9.9980
-0.0040
>> step(N,D)
>> A^2+10002*A+40000*eye(2)
ans =
0 0
0 0
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