Function populateSingleColumnQcompmatr

quest/src/core/printer.cpp:880–892

void populateSingleColumnQcompmatr(qcompmatr &matr, qindex startInd, PauliStrSum sum) {

    // matr is single-column, and has been prior resized such that 
    // even before population, matr.size() is non-zero unless it is
    // intended to stay empty
    size_t numCoeffs = matr.size(); // numRows
    if (numCoeffs == 0)
        return;

    // serially copy the CPU-only, non-distributed coefficients
    for (size_t i=0; i<numCoeffs; i++)
        matr[i][0] = sum.coeffs[startInd + i];
}


// T can be any 1D type, i.e. Qureg (.isDensity=0), FullStateDiagMatr, DiagMatr1, DiagMatr2, DiagMatr