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

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revision 2137, Mon Mar 17 22:21:24 2008 UTC revision 2151, Thu Mar 20 23:31:22 2008 UTC
# Line 133  Line 133 
133    --> see comment in determinant(<dsC>) in R/dsCMatrix.R, will give    --> see comment in determinant(<dsC>) in R/dsCMatrix.R, will give
134    faster determinant    faster determinant
135    
 - Cholesky() generalized: provide R interface cholmod_factorize_p()  
   which factorizes |A + beta*I| ==> R interface to fast det|A + b*I|  
   
136  - tr(A %*% B) {and even  tr(A %*% B %*% C) ...} are also needed  - tr(A %*% B) {and even  tr(A %*% B %*% C) ...} are also needed
137    frequently in some computations {conditional normal distr. ...}.    frequently in some computations {conditional normal distr. ...}.
138    Since this can be done faster than by    Since this can be done faster than by
# Line 182  Line 179 
179    replCmat() uses as_CspClass() and drop0(.) which itself call    replCmat() uses as_CspClass() and drop0(.) which itself call
180    as_CspClass() quite a bit.  --> try to replace these by    as_CspClass() quite a bit.  --> try to replace these by
181    as(*, "CsparseMatrix"); forceSymmetric, etc.    as(*, "CsparseMatrix"); forceSymmetric, etc.
182    
183    - add examples (and tests!) for update(<CHMfactor>, ..) and
184      Cholesky(......, Imult), also tests for hidden {hence no examples}
185      ldetL2up() { R/CHMfactor.R }

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