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Scilab help >> Linear Algebra > Matrix Pencil > lyap


Lyapunov equation

Calling Sequence



A, C

real square matrices, C must be symmetric


X= lyap(A,C,flag) solves the continuous time or discrete time matrix Lyapunov matrix equation:

A'*X + X*A = C       ( flag='c' )
A'*X*A - X = C       ( flag='d' )

Note that a unique solution exist if and only if an eigenvalue of A is not an eigenvalue of -A (flag='c') or 1 over an eigenvalue of A (flag='d').


A'*X + X*A -C
A'*X*A - X -C

See Also

  • sylv — Sylvester equation.
  • ctr_gram — controllability gramian
  • obs_gram — observability gramian
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Last updated:
Tue Apr 02 17:36:21 CEST 2013