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| Create and return a sparse matrix? [ Reply ] By: Henrik Alsing Friberg on 2011-06-03 14:56 | [forum:4531] |
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Hey All, I wonder if anybody knows the best way to create and return a sparse matrix from a C++ coded R-package using the functions exported by the Matrix package. My best guess is to: (1) Call this function to get a CHM_SP: M_cholmod_allocate_sparse (2) Set the values of the CHM_SP. (3) Call this function to transform the CHM_SP into a SEXP, and free the original CHM_SP which we no longer want: M_chm_sparse_to_SEXP (4) Return the obtained SEXP. The problem with this is that the function M_chm_sparse_to_SEXP copies all of the data from the CHM_SP to another location. This is both time and memory consuming for large matrices.. Do anyone here know a better way? |
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