我直接调用内部函数DNCONG来求解一个优化问题,程序运行中出现如下的错误并终止。请问是什么问题,该从什么地方下手修改程序。谢谢!!
NUMBER OF FUNC-CALLS: NFUNC = 14
NUMBER OF GRAD-CALLS: NGRAD = 7
NUMBER OF QL-CALLS: NQL = 7
*** FATAL ERROR 2 from DNCONG. The line search used more than 5 function
*** calls, therefore it has been declared unsuccessful.