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**1673**- (**download**) (**annotate**)*Mon Nov 6 20:54:26 2006 UTC*(13 years, 4 months ago) by*maechler*File size: 6952 byte(s)

host of changes; mostly indexing(sub-set & -assign) for symmetric and [ cbind(i,j) ]

- Sparse matrix methods can now be based on the CHOLMOD package. We will need to migrate from the current code to CHOLMOD-based code using #ifdef USE_CHOLMOD. Some of the things to be done - Move documentation from subdirectories of src to inst/doc - Write utilities to create a cholmod_sparse pointer from a dgCMatrix or lgCMatrix (or zgCMatrix) object without copying and allocating. - Start adding simple S4 methods ( %*%, +, cbind, t) for CsparseMatrix using CHOLMOD. - check to see if the .onLoad function to require the methods package (in the AllClass.R file) is needed -- no, it is not: "Depends: " in DESCRIPTION suffices. - Should the uplo and diag slots continue to be stored as character? An alternative is to use a factor as in the enum values for the cblas. -- Leave as character but use care in determining the default cases -- E.g. Checks for diag slot should check for 'U' or 'u' vs. anything else - Organization of the source code files - right now they are organized according to class (e.g. dgeMatrix.R, dgeMatrix.h, dgeMatrix.c). Is there a better way? -- This seems ok. - Fix the calculation of the Dim slot for the crossprod method for dgCMatrix objects (too tired to do that now). -- Done - spelling style: Should "coersion" be "coercion" ? -- Yes. Watch for this. - src/Metis/ : one of the two Makefiles needs fixing, as changing 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 --DB - now have both working, I believe. - man/Matrix.Rd : has example with dimnames, but we just drop them! MM thinks dimnames should be supported (but then ...) -- added 'Dimnames' slot (2005-02-10) - bCrosstab(): yes, we really do want the diagonal "V:V" crosstabs. -- explained a bit more in man/bCrosstab.Rd - Clean up vestigial functions (pdFactor, pdMatrix, matrix<-) from the nlme package. - create a class of permutation matrices for use in expand. The current expand method for the LU factorization is not complete because it does not provide the permutation. - tcrossprod() now works: C code now "exported" via init.c - Fixed: dtpMatrix(... diag = "U") (i.e., unit-diagonal packed triangular) *does* need 'x' entries for the diagonal but these are never looked at. -> changed doc -- Lapack also says they are not referenced but assumed 1. - in lmer.c check all instances of the use of ZtX and XtX and change them so that having a negative last element of nc means use the response only (but look for it in the right place). - Solved: 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 or 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} - slot "factors" maybe should move up to "Matrix" -- done, 2005-09-28 - group generics: "Arith", also "Compare", "Math" etc; see ?Math and the examples in ?SetGeneric - methods for rbind and cbind where they make sense: R 2.2.0 (and newer) provide cbind2() and rbind2() generics and default methods [following John Chambers's proposition], and we have implemented methods for them. - arithmetic for sparse matrices: done for <sparseMatrix> o <scalar> {more needed: see TODO} - rcond() of a singular dpoMatrix gives a LaPack error instead of just 0: MM <- crossprod(M <- Matrix(c(1:4,9:6), 2,4)) ; rcond(MM) Done(2005-10-03): The error message is more helpful now. - implement diagonal Matrix class "ddiMatrix" etc using constructor function Diagonal() {and extractor diag()}. Done(2006-01-03) - new("ltTMatrix") now at least prints -- Done by version 0.995-1 --- - Migration of lmer from the mer representation to the mer2 representation and the use of the CHOLMOD code for the sparse matrix decomposition. Some of the things that need to be done. - Matrices in the mer2 representation are classed matrices, in the mer representation they were unclassed. Any parts inside the C code that would access, for example, REAL(GET_SLOT(x, Matrix_RXXSym)) need to be modified to access REAL(GET_SLOT(GET_SLOT(x, Matrix_RXXSym), Matrix_xSym)) This is especially important for Omega but I think I have done those changes already. - The components named *X* in an mer object refers to an augmented design matrix of p+1 columns. In the mer2 object there are separate slots for rZy and rXy. The scalar y'y is the first element of devComp. - Presently nc is of length nf+1 and the last element is n, the number of observations. This value should be moved to devComp and nc made of length nf. - The slot L is a list of length 1 that contains an ExternalPointer to a cholmod_factor object. This contains a permutation which is most easily accessible through cholmod_solve(CHOLMOD_P,...) or cholmod_solve(CHOLMOD_Pt,...). The ZtX, Zty, RZX and rZy slots actually contain P%*%RZX and P%*%rZy - "[<-" Methods for dgC* and dgT* the former building on the latter using j = .Call("Matrix_expand_pointers", x@p, PACKAGE = "Matrix") where needed - Put the matrix 'mm' and the response vector 'y' into 'KNex', a list. Modified all examples and tests that used them and the Comparisons vignette. - rowSums(), colSums(), rowMeans & colMeans() now should work for all sparse and dense matrices, via "dgeMatrix", "dgC*" and "dgT*". - Suitably adjust classes of matrices after subscripting. head(Hilbert(9)) and the equivalent expression Hilbert(9)[1:4,] now work and return "dgeMatrix" (and not ..symmetric..). We try to propagate the class to the subscripted matrix but, if that fails its test, fall back on a general matrix class. -- for dense That is, the fallback class for dsyMatrix, etc. is dgeMatrix; the fallback class for dsCMatrix is dgCMatrix, etc. - tril(), triu() now return matrices of *triangular* classes. - Factorizations: LU and solve() for *sparse* Matrices is now done, ----------------- using CSparse (and not UMFPACK as originally thought) - M[i,j] <- "sub-Matrix" now works. - "Compare" for dgC & dgT --- to be able to do M[M > 10] etc - new("ltTMatrix", diag = "U", Dim = c(2:2, 2:2)) now works - Diagonal(3) - toeplitz(c(0,1,0)) or Diagonal(4) >= 0 now work - .Call(Csparse_Csparse_crossprod, ...) for crossprod(x,y) {2-args} - When 'x' is a symmetric matrix, a) x[i,i] should return a *symmetric* matrix too (when 'i' has length > 1) b) x[i,i] <- scalar_value should ``keep x symmetric'', i.e. also return symmetricM*

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