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+//caption:obtain_time_response
+//example 12_59
+//page 590
+s=%s;
+syms t
+A=[-1 0;1 -1]
+B=[0 1]'
+x0=[1 0]'
+[r c]=size(A);//size of matrix A
+p=s*eye(r,c)-A;//s*I-A where I is identity matrix
+q=det(p)//determinant of sI-A
+r=inv(p)//inverse of sI-A
+m=r*B*(1/s)
+r1=r*x0
+X=r1+m
+//for calculating zero state response
+x=[0;0]
+x(1,1)=ilaplace(X(1,1),s,t);
+x(2,1)=ilaplace(X(2,1),s,t);
+disp(x,"zero input response of the system,x(t)=");