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用多重网格算法求解线性方程组Ax=b,算法求解过程中按理只需要给定系数粗细网格的系数矩阵就可以了,但在看算法理论时,都涉及到粗细网格的位置关系的判定来确定插值矩阵、限定矩阵。这个就需要在算法上导入网格具体的物理位置了吧。这样好像不对(按理是只要给定系数矩阵A,b,就能求解Ax=b)对于这点一直想不明白