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An element of a sparse matrix corresponds to the subscript of one-dimensional array

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Sparse matrices: A large number of elements in a matrix are zero

The storage coefficient matrix usually only exists in the triangle or the lower triangle

The other half of the information is inferred from the known information

One, Upper triangle a[4][4]

The upper triangle corresponds to the subscript of the array: (2n-i+1) *i/2+j

Two, the lower triangle

The upper triangle corresponds to the subscript of the array: (i+1) *i/2+j

An element of a sparse matrix corresponds to the subscript of one-dimensional array

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