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Message: <blockquote data-quote="John Jurcevic" data-source="post: 26020" data-attributes="member: 807">Use a one dimensional array/vector and let your accessor methods take care of figuring out how to access a particular matrix element.  Think about having a base class and then sub-classes for vectors, upper/lower-triangular, diagonal, banded, banded upper/lower-triangular, and sparse matrices.  Think about an easy implementation for the transpose.  Make sure you can deal with the 1000000x1000000 sparse matrix that Dan will give you on the final exam.Or just use some matrix library like uBlas...</blockquote>