利用矩阵的极分解，导出了逆特征值问题的最佳逼近解。
The optimal approximate solution of this inverse eigenvalue problem also was given by means of the polar decomposition of matrices.
并给出某些特殊条件下的最佳逼近解的求法及解的表达式。
The general solving method is given. The algorithms and expressions of the solutions are provided under some special conditions.
另外，给出了中心对称最小秩解集合中与给定矩阵的最佳逼近解。
In addition, for the minimal rank solution set, the expression of the optimal approximation solution to a given matrix is derived.
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