ned。ptimizati。n；c。njugate gradientemeth。d；w 。Ife line search c。nditi。ns；suffic descent property；global convergence· CLC number：O221．2 Document code：A 1 Introduction The conjugate gradient method is designed to so!Ve the following unconstrained no l；“。optimization problem min厂( )，(]) e where厂：R一R is a smooth，nonlinear function whose gradient will be denoted by g ·The iter嚣÷ Ve forn1u1a of the conjugate gradient method is given ......