Syntax nrm = normest(S) nrm = normest(S,tol) [nrm,count] = normest(...) Description
This function is intended primarily for sparse matrices, although
it works correctly and may be useful for large, full matrices as well.
an estimate of the 2-norm of the matrix nrm = normest(S) S. uses
relative error nrm = normest(S,tol) tol instead of the default tolerance 1.e-6.
The value of tol determines when the estimate is
considered acceptable. returns
an estimate of the 2-norm and also gives the number of power iterations
used. [nrm,count] = normest(...)
More About expand all
The power iteration involves repeated multiplication by the
S and its transpose, S'.
The iteration is carried out until two successive estimates agree
to within the specified relative tolerance.
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