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

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revision 2105, Tue Jan 15 10:16:29 2008 UTC revision 2106, Wed Jan 23 09:36:04 2008 UTC
# Line 184  Line 184 
184    
185  - chol() and qr() generic:  currently have *two* arguments, and give  - chol() and qr() generic:  currently have *two* arguments, and give
186    
187    New generic for "chol" does not agree with implicit generic from package "base"; a new generic will be assigned with package "Matrix"    New generic for "chol" does not agree with implicit generic from package
188      "base"; a new generic will be assigned with package "Matrix"
189    New generic for "qr" does not agree with implicit generic from package "base"; a new generic will be assigned with package "Matrix"    (and ditto for "qr")
190    
191    It was mentioned by an R-core member that he thought it did not make    It was mentioned by an R-core member that he thought it did not make
192    sense to also dispatch on 'tol' or 'pivot' ...  --> maybe change that..    sense to also dispatch on 'tol' or 'pivot' ...  --> maybe change that..
193    
194    - eigen() should become generic, and get a method at least for diagonal,
195      but also for symmetric -> dsyMatrix  [LAPACK dsyev() uses UPLO !],
196      but also simply for dgeMatrix (without going via tradition matrices).
197      What about Sparse?  There's fill-in, but it may still be sensible, e.g.
198      mlist <- list(1, 2:3, diag(x=5:3), 27, cbind(1,3:6), 100:101)
199      ee <- eigen(tcrossprod(bdiag(lapply(mlist, as.matrix))))
200      Matrix( signif(ee$vectors, 3) )
201    
202    - facmul() has no single method defined;  it looks like a good idea though
203      (instead of the infamous qr.qy, qr.qty,.... functions)

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