The Row/Column Data Vector class contains information about one column or one row. The viewers request information about rows or columns by calling the _getRowInfo or _getColumnInfo methods of the ...

Each row/column data vector deals only with one row or column at a time. If this row/column data vector is used as an argument to the _getRowInfo or _setRowInfo method, this value is interpreted as ...

Add to directional derivative note the discussion about whether the gradient is a row or a column vector. From Piazza discussion: Is the gradient a row vector or a column vector? (and does it matter?) ...