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  Alternatively, can now print(<sparseMatrix>, col.names = TRUE, .....)
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  Alternatively, can now print(<sparseMatrix>, col.names = TRUE, .....)
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- Fast colSums(), rowSums() etc : first for dgCMatrix, but then
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- Fast colSums(), rowSums() etc : first for dgCMatrix, but then
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  'arules' needs fast colSums() and rowSums() - for ngCMatrix;
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  'arules' needs fast colSums() and rowSums() - for ngCMatrix;
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  do it for "nMatrix" and "lMatrix" and return *integer*
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  do it for "nMatrix" and "lMatrix" and return *integer*
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- now check for DimNames propagation in coercions, at least by using a
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  "dimnamed" matrix in tstMatrixClass() in tests/Class+Meth.R
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