issue of too large memory usage. #7
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According to the paper, it is sufficient to have the diagonal (and sub-diagonal) part of the matrix in Newton's method without having the matrix as it is. Therefore, the computational (memory and time) complexity is O(n) instead of O(n^2).
However, the source code has matrix as it is, which is different from the algorithm in the paper.
This request solves the above problem.