Home > freetb4matlab > sparse > normest.m

normest

PURPOSE ^

% Estimate the 2-norm of the matrix @var{a} using a power series

SYNOPSIS ^

function [e1, c] = normest (A, tol)

DESCRIPTION ^

% -*- texinfo -*-
% @deftypefn {Function File} {[@var{n}, @var{c}] =} normest (@var{a}, @var{tol})
% Estimate the 2-norm of the matrix @var{a} using a power series
% analysis.  This is typically used for large matrices, where the cost
% of calculating the @code{norm (@var{a})} is prohibitive and an approximation
% to the 2-norm is acceptable.
%
% @var{tol} is the tolerance to which the 2-norm is calculated.  By default
% @var{tol} is 1e-6.  @var{c} returns the number of iterations needed for
% @code{normest} to converge.
% @end deftypefn

CROSS-REFERENCE INFORMATION ^

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