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板凳
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发表于 2004-3-4 22:31:19
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请各位高手指点一二:如何在SAS里求解一元高次线性方程?
SAS can do it in many ways, depends upon how do you formulate your question. One of the most general ways is PROC NLP in SAS/OR. NLP for nonlinear programming. You want to solve a equation, say, f(x)=0. You can reformulate your question as finding x such that f(x)**2 reach its minimum. If the minimum is 0, you got the solution, otherwise, there is no solution at all. Surely, we are talking about numerical solution, not analytical. By default, we are looking for only real solution, not the number in other space. |
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