The Conjugate Gradient Method(CGM) is one of the methods to find extreme value solution of the poly-variable function. It has been proved that the problems to solve linear equations are equivalent to the problem to find extreme miniumum value of its quadratic equation. If the equation is linear, the true swolution can be get by finite steps of iteration theoretically. The merits of CGM are the storage capccity reduced and calculation ratio accelerated. In this papr, it is introduced that CGM is a suitable method for solving large sparse matrix equations, such as the 3-D electro-magnetic numeric calcualtion on the micro-computer.
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