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Amiga Format CD46 (1999-10-20)(Future Publishing)(GB)[!][issue 1999-12].iso
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rank.1
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1999-09-16
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671b
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rank(G) Scilab Function 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
rank(X) 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 conse-
quence
rank([1.d-80,0;0,1.d-80]) is 2 !.
SEE ALSO
svd, qr, rowcomp, colcomp.