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                /* Sparse matrices in triplet form */
#include "Tsparse.h"
#include "chm_common.h"

SEXP Tsparse_validate(SEXP x)
{
    SEXP
    islot = GET_SLOT(x, Matrix_iSym),
    jslot = GET_SLOT(x, Matrix_jSym),
    dimslot = GET_SLOT(x, Matrix_DimSym);
    int j,
    *dims = INTEGER(dimslot),
    ncol, nrow, nnz = length(islot),
    *xj = INTEGER(jslot),
    *xi = INTEGER(islot);

    if (length(jslot) != nnz)
    return mkString(_("lengths of slots i and j must match"));
    if (length(dimslot) != 2)
    return mkString(_("slot Dim must have length 2"));
    nrow = dims[0]; ncol = dims[1];
    for (j = 0; j < nnz; j++) {
    if (xi[j] < 0 || xi[j] >= nrow)
        return mkString(_("all row indices must be between 0 and nrow-1"));
    if (xj[j] < 0 || xj[j] >= ncol)
        return mkString(_("all column indices must be between 0 and ncol-1"));
    }
    return ScalarLogical(1);
}

SEXP Tsparse_to_Csparse(SEXP x, SEXP tri)
{
    cholmod_triplet *chxt = as_cholmod_triplet(x);
    cholmod_sparse *chxs = cholmod_triplet_to_sparse(chxt, chxt->nnz, &c);
    int uploT = 0; char *diag = "";

    Free(chxt);
    if (asLogical(tri)) {   /* triangular sparse matrices */
    uploT = (strcmp(CHAR(asChar(GET_SLOT(x, Matrix_uploSym))), "U")) ?
        -1 : 1;
    diag = CHAR(asChar(GET_SLOT(x, Matrix_diagSym)));
    }
    return chm_sparse_to_SEXP(chxs, 1, uploT, diag,
                  duplicate(GET_SLOT(x, Matrix_DimNamesSym)));
}