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

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revision 983, Tue Oct 11 15:19:20 2005 UTC revision 984, Tue Oct 11 18:08:46 2005 UTC
# Line 1  Line 1 
1    - Migration of lmer from the mer representation to the mer2
2       representation and the use of the CHOLMOD code for the sparse
3       matrix decomposition.  Some of the things that need to be done.
4    
5       - Matrices in the mer2 representation are classed matrices, in the
6       mer representation they were unclassed.  Any parts inside the C
7       code that would access, for example,
8        REAL(GET_SLOT(x, Matrix_RXXSym))
9       need to be modified to access
10        REAL(GET_SLOT(GET_SLOT(x, Matrix_RXXSym), Matrix_xSym))
11       This is especially important for Omega but I think I have done
12       those changes already.
13    
14       - The components named *X* in an mer object refer to an augmented
15       design matrix of p+1 columns.  In the mer2 object there are
16       separate slots for rZy and rXy.  The scalar y'y is the first
17       element of devComp.
18    
19       - Presently nc is of length nf+1 and the last element is n, the
20       number of observations.  This value should be moved to devComp and
21       nc made of length nf.
22    
23       - The slot L is a list of length 1 that contains an ExternalPointer
24       to a cholmod_factor object.  This contains a permutation which is
25       most easily accessible through cholmod_solve(CHOLMOD_P,...) or
26       cholmod_solve(CHOLMOD_Pt,...).  The ZtX, Zty, RZX and rZy slots actually
27       contain P%*%RZX and P%*%rZy
28    
29    ------
30  - Sparse matrix methods can now be based on the CHOLMOD package.  We  - Sparse matrix methods can now be based on the CHOLMOD package.  We
31     will need to migrate from the current code to CHOLMOD-based code     will need to migrate from the current code to CHOLMOD-based code
32     using #ifdef USE_CHOLMOD.  Some of the things to be done     using #ifdef USE_CHOLMOD.  Some of the things to be done

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