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#### Sparse Matrices in Compressed column-oriented format

### contains = "dsparseMatrix", "CsparseMatrix"

## Specific conversions, should they be necessary.  Better to convert as
## as(x, "TsparseMatrix") or as(x, "denseMatrix")

## Moved to ./Csparse.R :
## setAs("dgCMatrix", "dgTMatrix", ....
## setAs("dgCMatrix", "dgeMatrix", ....
## setAs("dgeMatrix", "dgCMatrix", ....

## rather use Csparse* to lsparse* in ./lsparseMatrix.R ,
## but this is for "back-compatibility" (have had tests for it..):

setAs("dgCMatrix", "ngCMatrix",
      function(from) .Call(Csparse_to_nz_pattern, from, FALSE))

setAs("dgCMatrix", "lgCMatrix",
      function(from) { ## FIXME use .Call() too!
      r <- new("lgCMatrix")
      r@x <- as.logical(from@x)
      ## and copy the other slots
      for(nm in c("i", "p", "Dim", "Dimnames"))
          slot(r, nm) <- slot(from, nm)
      r
      })

setMethod("image", "dgCMatrix",
      function(x, ...) {
          x <- as(x, "dgTMatrix")
          callGeneric()
      })

## Group Methods, see ?Arith (e.g.)
## -----
##
## "Arith" is now in ./Ops.R
##
## "Math" is up in ./Csparse.R
##
## "Math2" is up in ./dMatrix.R


###---- end {Group Methods} -----------------


## "[<-" methods { setReplaceMethod()s }  are now in ./Csparse.R

setMethod("writeHB", signature(obj = "dgCMatrix"),
      function(obj, file, ...) {
          .Deprecated("writeMM")
          .Call(Matrix_writeHarwellBoeing, obj,
            as.character(file), "DGC")
      })

setMethod("writeMM", signature(obj = "dgCMatrix"),
      function(obj, file, ...)
      .Call(Matrix_writeMatrixMarket, obj, as.character(file), "DGC"))

##-> ./colSums.R  for colSums,... rowMeans

setMethod("qr", signature(x = "dgCMatrix"),
      function(x, tol = 1e-07, LAPACK = FALSE)
      .Call(dgCMatrix_QR, x, TRUE))

setMethod("lu", signature(x = "dgCMatrix"),
      function(x, ...) .Call(dgCMatrix_LU, x, TRUE, 1))

setMethod("solve", signature(a = "dgCMatrix", b = "matrix"),
      function(a, b, ...) .Call(dgCMatrix_matrix_solve, a, b),
      valueClass = "dgeMatrix")

setMethod("solve", signature(a = "dgCMatrix", b = "ddenseMatrix"),
      function(a, b, ...) .Call(dgCMatrix_matrix_solve, a, b),
      valueClass = "dgeMatrix")
setMethod("solve", signature(a = "dgCMatrix", b = "dsparseMatrix"),
      function(a, b, ...)
      .Call(dgCMatrix_matrix_solve, a, as(b, "denseMatrix")),
      valueClass = "dgeMatrix")

setMethod("solve", signature(a = "dgCMatrix", b = "missing"),
      function(a, b, ...) .Call(dgCMatrix_matrix_solve, a, b=NULL),
      valueClass = "dgeMatrix")