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

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revision 1244, Wed Apr 12 12:28:04 2006 UTC revision 1245, Wed Apr 12 20:31:18 2006 UTC
# Line 90  Line 90 
90    ## and the same in a similar situation involving  "dpo", "dpp"    ## and the same in a similar situation involving  "dpo", "dpp"
91    
92  - "Compare" for dgC & dgT  --- want to be able to do  M[M > 10]  etc  - "Compare" for dgC & dgT  --- want to be able to do  M[M > 10]  etc
93    
94    - Things like  M[upper.tri(M)] are not really most useful for  sparse
95      matrices.  --> provide generic functions
96      upperTriMatrix(), lowerTriMatrix()  both with argument  'diag = TRUE'
97      (which can be set to FALSE of course) which are used to extract a
98      triangle from an arbitrary sparse matrix and  return a  "dtCMatrix".
99    
100    - Factorizations: LU [ -> solve() ] and Schur()  for  *sparse*  Matrices.
101      -----------------  LU-sparse is the purpose of all of ./src/UMFPACK/
102            -->  ./inst/doc/UFsparse/*
103      And then, possibly eigen(), svd(), qr(), ... for sparse
104      {probably base some on the fast  chol() of CHOLMOD}.

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