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[matrix] Diff of /pkg/Matrix/TODO
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Diff of /pkg/Matrix/TODO

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revision 2552, Thu Jun 24 19:36:40 2010 UTC revision 2553, Sat Jun 26 06:50:03 2010 UTC
# Line 219  Line 219 
219    This is not particularly exciting, and also does *not*, I think    This is not particularly exciting, and also does *not*, I think
220    help for defining a chol2inv() method for  *sparse* (upper)    help for defining a chol2inv() method for  *sparse* (upper)
221    triangular matrices.    triangular matrices.
222    
223    - sort(<sparseVector>, partial=..), needed, e.g. for mean(*, trim = .).
224      Note that defining xtfrm() does not "help" (as sort() then goes via dense
225      index).  See "mean" in R/Matrix.R

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