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.
Strang的分析被应用于所谓的带状矩阵上；带状矩阵的绝大多数项都是0；唯一的例外是矩阵中心或靠近矩阵中心的对角带。
Seeking a power of general matrix is often through seeking a power of diagonal matrix .
通常是将求一般矩阵的方幂转化为求对角矩阵的方幂。
However, seeking a power of diagonal matrix is very difficult usually.
然而转化为求对角矩阵的方幂比较困难。
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