+
−function retval = is_observable (a,c,tol)
+
−
+
−# usage: is_observable (a, c {,tol})
+
−#
+
−# Returns 1 if the pair (a, c) is observable, or 0 if not.
+
−#
+
−# See also: size, rows, columns, length, is_matrix, is_scalar, is_vector.
+
−
+
−# Written by A. S. Hodel (scotte@eng.auburn.edu) August 1993.
+
−
+
−  if (nargin == 2)
+
−    retval = is_controllable (a', c');
+
−  elseif (nargin == 3)
+
−    retval = is_controllable (a', c', tol);
+
−  else
+
−    error ("usage: is_observable (a, c {,tol})");
+
−  endif
+
−
+
−endfunction