Info

Warning: Could not get change notification handle for local C:\Archivos de
programa\MATLAB\R2007b\work.
Performance degradation may occur due to on-diskdirectory change checking.
>> 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