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

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revision 2017, Wed Aug 1 15:18:25 2007 UTC revision 2018, Wed Aug 1 15:22:05 2007 UTC
# Line 151  Line 151 
151    shows that the Cholesky factorization is computed ``too quickly''.    shows that the Cholesky factorization is computed ``too quickly''.
152    Can be a big pain for largish matrices, when it is unneeded.    Can be a big pain for largish matrices, when it is unneeded.
153    
154    - example(Cholesky, echo=FALSE) ; cm <- chol(mtm); str(cm); str(mtm)
155    
156      shows that chol() does not seems to make use of an already
157      present factorization and rather uses one with more '0' in x slot.
158    
159  - diag(m) <- val    currently automatically works via  m[cbind(i,i)] <- val  - diag(m) <- val    currently automatically works via  m[cbind(i,i)] <- val
160    However,    However,
161    we need methods for 'diag<-' at least for diagonalMatrix,    we need methods for 'diag<-' at least for diagonalMatrix,

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