code: @Override public void addNumCol(int colIdx, double value) {
      if (Double.isNaN(value) || Double.isInfinite(value)) {
        addInvalidCol(colIdx);
      } else {
        if( colIdx < _nCols ) {
          _nvs[_col = colIdx].addNumDecompose(value);
          if(_ctypes != null && _ctypes[colIdx] == Vec.T_BAD ) _ctypes[colIdx] = Vec.T_NUM;
        }
      }
    }
docs: Adds double value to the column.