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

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revision 2235, Wed Jul 23 10:24:17 2008 UTC revision 2236, Wed Jul 23 16:48:14 2008 UTC
# Line 189  Line 189 
189                   from class "integer" to "numeric" (i.e. double prec),                   from class "integer" to "numeric" (i.e. double prec),
190    since we want to be able to coerce large sparse matrices to sparse    since we want to be able to coerce large sparse matrices to sparse
191    vectors, where length maybe considerably larger than 2^32.    vectors, where length maybe considerably larger than 2^32.
192    
193    - We allow "over-allocated" (i,x)-slots for CsparseMatrix objects,
194      as per Csparse_validate() and the tests in tests/validObj.R. This is as
195      in CHOLMOD/CSparse, where nzmax (>= .@p[n]) corresponds to length(.@i),
196      and makes sense e.g. for M[.,.] <- v  assignments which could allocate in
197      chunks and would not need to re-allocate anything in many cases.
198      HOWEVER, replCmat() in R/Csparse.R is still far from making use of that.
199    

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