科研之友
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摘要
A new spectral conjugate gradient method (SDYCG) is presented for solving unconstrained optimization problems in this paper. Ourmethod provides a new expression of spectral parameter. This formula ensures that the sufficient descent condition holds. The search direction in the SDYCG can be viewed as a combination of the spectral gradient and the Dai-Yuan conjugate gradient. The global convergence of the SDYCG is also obtained. Numerical results show that the SDYCG may be capable of solving large-scale nonlinear unconstrained optimization problems.
