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[matrix] View of /pkg/TODO
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View of /pkg/TODO

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Revision 540 - (download) (annotate)
Thu Feb 10 14:32:59 2005 UTC (14 years, 7 months ago) by maechler
File size: 1540 byte(s)
more "Done"
- Report the problem in the Linux ldexp manual page.  The second and
  third calls in the Synopsis should be to ldexpf and ldexpl.

- [,] indexing

- group generics: "Arith", but also "Ops" and "Math";  see
  ?  and the examples in

- methods for rbind and cbind where they make sense

- bCrosstab(): do we really want the diagonal "V:V" crosstabs?
	       (if so or in any case: add to  man/bCrosstab.Rd )

- consider moving alloc3Darray from ./src/Mutils.c to

- data/ : names 'mm' and even more 'y' are  ``too short''.
	If we really want to keep them, don't use "LazyData"
	(such that one needs  data(*) explicitly);
	But MM would rather want something like and ex.y

- "factors" maybe should move up to "Matrix"


We have a (at least one) basic problem :
   Currently the show() method fail sometime after coercion:
   e.g. 'sy' show()s wrongly, even though it "str()" fine :

      (po <- crossprod(Matrix(0:3, 2))) # ok
      (ge <- as(po, "dgeMatrix")) # ok
      (sy <- as(po, "dsyMatrix")) # BAD
      str(sy) # looks fine

      example(expand) # -> ex$L and ex$U look bad, however
      as(ex$L, "dgeMatrix") # `works'

  {Of course, we don't need a workaround but must understand
   and solve the problem}


- implement (more) methods for supporting "packed" (symmetric / triangular)
  matrices; particularly something like pack() and unpack().

- implement diagonal Matrix class  "ddiMatrix" etc
  using constructor function Diagonal() or Diag().
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