Which is faster, the sparse or spdiag function?
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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
el 10 de Abr. de 2018
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
el 10 de Abr. de 2018
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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Walter Roberson
el 10 de Abr. de 2018
spdiags() invokes sparse() after packaging together the appropriate content and indices.
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