Which is faster, the sparse or spdiag function?

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d 2018-4-10

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评论： d 2018-4-11

In each iteration of a for loop I'm creating a big (approximatlly 10k*10k) five diagonal sparse matrix. Does anybody knows which function work faster? The sparse or spdiags. Is there a faster way to it if I only update the values of an existing sparse matrix in each iteration?

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Walter Roberson 2018-4-10

Be careful, updating an existing sparse matrix is slow if you are adding non-zero elements beyond what was allocated for the matrix with spalloc()

James Tursa 2018-4-10

Even if you are not exceeding the currently allocated memory for the matrix, it can be slow if the operation causes a large number of existing elements to be moved around in this memory.

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