how to combine two differnt GMatrix

[doityth777]

i have two GMatrix, like matrixA, matixB, and want to combine these into one
GMatrix. after the operation, the resulting matrix has the relation name of
matrixA, all the attr and data of both matrixA and matrixB. the function
mergeHoriz(...) doesn`t meet the demand.

[doityth777]

matrixA, matixB have the same number of rows

[Mike Gashler]

Would this do what you want?

1- use mergeHoriz

2- copy the relation name

Step 2 could be implemented like this:

if(matrixA.relation()->type() == GRelation::ARFF)

{

GArffRelation pRelA = (GArffRelation)matrixA.relation().get();

GArffRelation pRelMerged = (GArffRelation)pMatrixMerged->relation().get();

pRelMerged->setName(pRelA->name());

}

else

ThrowError("the relation of matrixA does not have a name");

(I did not try to compile this, so it may contain bugs.)

[doityth777]

thanks for you r help!! it is solved!

it is very easy to cast GArffRelation into GRelation, it is not clearly but by
type() function to do inversely. i add some code in function mergHoriz() to do
what i want above.

GMatrix* GMatrix::mergeHoriz(GMatrix* pSetA, GMatrix* pSetB)
{
    if(pSetA->rows() != pSetB->rows())
        ThrowError("Expected same number of rows");
    GArffRelation* pRel = new GArffRelation();
    sp_relation spRel;
    spRel = pRel;
    GRelation* pRelA = pSetA->relation().get();
    GRelation* pRelB = pSetB->relation().get();
    size_t nSetADims = pRelA->size();
    size_t nSetBDims = pRelB->size();
    pRel->addAttrs(pRelA);
    pRel->addAttrs(pRelB);
    if (pSetA->relation()->type() == GRelation::ARFF)
    {
        GArffRelation* p = (GArffRelation*)pSetA->relation().get();
        pRel->setName(p->name());
    }
    GMatrix* pNewSet = new GMatrix(spRel);
    Holder<GMatrix> hNewSet(pNewSet);
    pNewSet->reserve(pSetA->rows());
    double* pNewRow;
    for(size_t i = 0; i < pSetA->rows(); i++)
    {
        pNewRow = pNewSet->newRow();
        GVec::copy(pNewRow, pSetA->row(i), nSetADims);
        GVec::copy(&pNewRow[nSetADims], pSetB->row(i), nSetBDims);
    }
    return hNewSet.release();
}