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

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revision 2617, Tue Aug 24 21:49:09 2010 UTC revision 2618, Sat Sep 11 20:49:41 2010 UTC
# Line 116  Line 116 
116    and even more so for, e.g.  <sparse> %*% <dense>    and even more so for, e.g.  <sparse> %*% <dense>
117    {used in Soeren's 'gR' computations},    {used in Soeren's 'gR' computations},
118    we should also provide a generic and methods.    we should also provide a generic and methods.
119    - diag(A %*% B) might look like a "generalization" of tr(A %*% B),
120      but as the above tricks show, is not really.
121      Still, it's well worth to provide  diag.prod(A, B)
122    
123  - qr.R(qr(x)) may differ for the "same" matrix, depending on it being  - qr.R(qr(x)) may differ for the "same" matrix, depending on it being
124    sparse or dense:    sparse or dense:

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