Get the main diagonalofamatrix, or put a vector into the main diagonalofamatrix.
取得的主要矩阵,或将一个向量到对角线的主要矩阵对角线。
2
Strang s analysis applies to so-called banded matrices. Most of the Numbers in a banded matrix are zeroes; the only exceptions fall along diagonal bands, at or near the central diagonal of the matrix.