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hankelsv.5
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1999-09-16
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hankelsv(1) Scilab Function hankelsv(1)
NAME
hankelsv - Hankel singular values
CALLING SEQUENCE
[nk2,W]=hankelsv(sl [,tol])
[nk2]=hankelsv(sl [,tol])
PARAMETERS
sl : syslin list representing the linear system (state-space).
tol : tolerance parameter for detecting imaginary axis modes (default
value is 1000*%eps).
DESCRIPTION
returns nk2, the squared Hankel singular values of sl and W = P*Q = con-
trollability gramian times observability gramian.
nk2 is the vector of eigenvalues of W.
EXAMPLE
A=diag([-1,-2,-3]);
sl=syslin('c',A,rand(3,2),rand(2,3));[nk2,W]=hankelsv(sl)
[Q,M]=pbig(W,nk2(2)-%eps,'c');
slr=projsl(sl,Q,M);hankelsv(slr)
SEE ALSO
balreal, equil, equil1