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Be careful. The formula you found from that link, index = x + (y+1)*y/2 , includes the diagonal entries, and is for a lower triangular matrix, ... ... <看更多>

One source that I have has a definition (kind of hidden away in the questions): "An m×n matrix A is called upper triangular if all entries lying below the ... ... <看更多>

One can notice that in both the lower and upper triangular matrices, we have the main diagonal (row = column · For the lower triangular matrix we have entries ... ... <看更多>