A special matrix structure was adopted, that is, each row and each column has one matrix element, and the matrix elements are on the main diagonal symmetry.
我们取特殊的矩阵结构，矩阵每行，每列都有一个矩阵元，并且矩阵元位置是关于主对角线对称的。
How to replace non-diagonal elements in a matrix?
如何更换一个矩阵的非对角线元素？
It is proved that the stiffness matrix of the finite element solution is a block diagonal matrix and its elements are some symmetric and block circulant submatrices.
证明了有限元求解的刚度矩阵是一个块对角阵，且其子矩阵是某种对称、块循环矩阵。
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