BracketingNthOrderBrentSolver exceeds maxIterationCount while updating always the same boundary -----------------------------------------------------------------------------------------------
Key: MATH-716 URL: https://issues.apache.org/jira/browse/MATH-716 Project: Commons Math Issue Type: Bug Affects Versions: 3.0 Reporter: Pascal Parraud Priority: Minor In some cases, the aging feature in BracketingNthOrderBrentSolver fails. It attempts to balance the bracketing points by targeting a non-zero value instead of the real root. However, the chosen target is too close too zero, and the inverse polynomial approximation is always on the same side, thus always updates the same bracket. In the real used case for a large program, I had a bracket point xA = 12500.0, yA = 3.7e-16, agingA = 0, which is the (really good) estimate of the zero on one side of the root and xB = 12500.03, yB = -7.0e-5, agingB = 97. This shows that the bracketing interval is completely unbalanced, and we never succeed to rebalance it as we always updates (xA, yA) and never updates (xB, yB). -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira