Hi! I just speeded up a model by a factor of 10x by replacing a matrix-vector product with a loop which only processes the non-zero elements of the matrix. The matrix was a design matrix (thus the matrix was data for Stan) for the random effects part of a model. I assume that this is the same situa…

Sparse matrices in Stan

Krzysztof_Sakrejda January 29, 2018, 6:32pm 2

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