数值方法中常遇到的问题，有专门的函数链接库可以使用。IMSL是一套在 数值方法上经常被使用的商业函数链接库。Visual Fortran的专业版内含IMSL-Often confronted with the problem of numerical methods, specialized function link library can use. IMSL is a set of numerical methods are often used business functions l