PROBLEM TO BE SOLVED: To provide an effective method for mutually independently solving the equations of multi-dimensional elements without limiting a grain size while using an electronic computer. SOLUTION: When a row and a column (namely a vector X2) at the central part of an unfixed coefficient matrix 1 (a) expressing a matrix equation AX=B are erased, elements at four corners remain (b). When a coefficient matrix 1' (c) composed of these elements is prepared, it becomes a compressed coefficient matrix erasing the second row and the second column of the unfixed coefficient matrix 1. By repeating such operation, the matrix equation with the applied compressed square matrix as unfixed coefficients is solved and by inversely substituting that value, the solution of the entire matrix equation is provided.
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