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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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