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Affin-invariant Newton Techniques (ANT) - NLEQ2

NLEQ2 - an algorithmic extension of NLEQ1 to handle rank-deficient Jacobians
This code covers the features of NLEQ1 and includes additionally a special rank reduction device.


Additional properties of NLEQ2 are:


  • Rank reduction is done if the condition of the Jacobian exceeds a certain, internally set, maximum number (which may be also overwritten by the user - see above)
  • Optional indirect rank-1 (Broyden) updates are also available.

These files are available from the CodeLib: the NLEQ2 tar-archive (use "load to disk") , and


ANT - Introduction   Codes - Introduction  NLEQ1   NLEQ1S
NLEQ2                    GIANT                        References