Ok, I will bump this once ... The "worst" problem I encountered is that sparse matrices do not seem to support the kind of indexing I need. At least I get "NotImplementedError: sequence indexing not yet fully supported" and "<sparse matrix type> supports slices only of a single row" errors all the time.
Any advice on how to manage the transition ndarray -> sparse.matrix? Maybe I should wait until sparse matrix support in NumPy has matured? Thank you, David
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