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

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revision 530, Mon Feb 7 10:58:27 2005 UTC revision 918, Thu Sep 15 18:08:59 2005 UTC
# Line 1  Line 1 
1    - Sparse matrix methods can now be based on the CHOLMOD package.  We
2       will need to migrate from the current code to CHOLMOD-based code
3       using #ifdef USE_CHOLMOD.  Some of the things to be done
4    
5       - Move documentation from subdirectories of src to inst/doc
6       - Write utilities to create a cholmod_sparse pointer from a
7       dgCMatrix or lgCMatrix (or zgCMatrix) object without copying and
8       allocating.
9       - Start adding simple S4 methods (rcond, %*%, +, cbind, t).
10    
11  - Report the problem in the Linux ldexp manual page.  The second and  - Report the problem in the Linux ldexp manual page.  The second and
12    third calls in the Synopsis should be to ldexpf and ldexpl.    third calls in the Synopsis should be to ldexpf and ldexpl.
13    
14  - [,] indexing  - [,] indexing: for sparse "works", but not yet for negative indices!
15    
16  - group generics: "Arith", but also "Ops" and "Math";  see  - group generics: "Arith" (partly done),
17    ?Math.data.frame  and the examples in    but also "Compare", "Math" etc;
18    ?SetGeneric    see ?Math  and the examples in ?SetGeneric
19    
20  - bCrosstab(): do we really want the diagonal "V:V" crosstabs?  - methods for rbind and cbind where they make sense
21                 (if so or in any case: add to  man/bCrosstab.Rd )    (Kurt is particularly interested in dgCMatrix ones, for pkg 'arules')
22      ****> UNFEASIBLE as long cbind is function(..., *) !!!! <*******
23  - src/Metis/ : one of the two Makefiles needs fixing, as changing      --> follow John's proposition  cbind(x, ...) via Generic cbind2(x,y)?
              src/Metis/*.c  does not lead to recompilation.  
   --DB - it seems both Makefiles need fixing.  I think I have the  
              src/Metis/Makefile fixed but not src/Makefile  
24    
25  - man/Matrix.Rd :  has example with dimnames, but we just drop them!  - consider moving alloc3Darray from ./src/Mutils.c to
26                  MM thinks dimnames should be supported (but then ...)    $(RSRC)/src/base/array.c
27    
28  - data/ : names 'mm' and even more 'y' are  ``too short''.  - data/ : names 'mm' and even more 'y' are  ``too short''.
29          If we really want to keep them, don't use "LazyData"          If we really want to keep them, don't use "LazyData"
30          (such that one needs  data(*) explicitly);          (such that one needs  data(*) explicitly);
31          But MM would rather want something like  ex.mm and ex.y          But MM would rather want something like  ex.mm and ex.y
32    
33  - "factors" maybe should move up to "Matrix"  -  slot "factors" maybe should move up to "Matrix"
34    
35  -------  -------
36    
# Line 42  Line 49 
49    
50    {Of course, we don't need a workaround but must understand    {Of course, we don't need a workaround but must understand
51     and solve the problem}     and solve the problem}
52    
53    ---
54    
55    - provide methods for "dspMatrix" and "dppMatrix"!
56    
57    - implement (more) methods for supporting "packed" (symmetric / triangular)
58      matrices; particularly something like pack() and unpack()  [to/from our
59      classes from/to "numeric"] --- have already man/unpack.Rd but no method yet!
60    
61      (have some dtr* <-> dtp*)
62    
63    - implement diagonal Matrix class  "ddiMatrix" etc
64      using constructor function Diagonal() or Diag().
65    
66    BUG: rcond() of a singular dpoMatrix gives a LaPack error instead of just 0:
67      MM <- crossprod(M <- Matrix(c(1:4,9:6), 2,4)) ; rcond(MM)
68      ##> Error in rcond(MM) : Lapack routine dpotrf returned error code 4
69    
70    
71    ---
72    
73    - combine the C functions for multiplication by special forms and
74      solution wrt special forms by using a 'right' argument and a
75      'classed' argument.
76       [done with dgeMatrix_matrix_mm();  not yet for other classes;
77        and for _crossprod()]
78    
79    - add more comprehensive examples / tests for Schur decomposition
80    
81    - arithmetic for sparse matrices:
82                 <sparseMatrix>  o  { <scalar> | <same-dim-sparseMatrix> }
83      should return a sparse matrix  for at least "+" and "*" , also %%,
84      and "/" and "%/%" at least when the RHS is non-zero a scalar.
85    
86    ---
87    
88    - Create a Harwell-Boeing version of the matrix mm and the response
89      vector y in inst/external and remove them from the data directory.
90      Modify any examples that use them and modify the Comparisons vignette.

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