Abstract
Conjugate gradient method holds an important role in solving unconstrained Optimizations , especially for large scale problems. Numerous studies and modific ations have been done to improve this method . In this paper , we propose a new conjugate gradient meth od which is computed by modifying Dai and Yuan formula . This new k formula for the denominator is introduced and the numerator of Dai and Yuan for mula is retrained , but still possesses global converge nce properties. Numerical results based on number of iterations and number of function evaluations by usin g exact line search have shown that the new formul a is an efficient when we comparative it with the oth er conjugate gradient methods.
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