rank(G)

NAME
rank - rank

CALLING SEQUENCE
[i]=rank(X)
[i]=rank(X,tol)

PARAMETERS

X   : real or complex matrix

tol : nonnegative real number

DESCRIPTION
is the numerical rank of X i.e. the number of singular values
of X that are larger than norm(size(X),'inf') * norm(X) * %eps.

rank(X,tol) is the number of singular values of X that
are larger than tol.

Remark
Note that the default value of tol is proportional to norm(X). As a consequence

rank([1.d-80,0;0,1.d-80]) is 2 !.

SEE ALSO
svd, qr, rowcomp, colcomp.