Return the i-th row of the matrix.
Return the i-th row of the matrix. The vector will be resized if it doesn't have the right length.
Notice that due to the row major nature of matrices, row read/writes are *much* faster than col read/writes.
Alternatively, one could use the more costly CVisDVector CVisDMatrix::Row(int r) method.
To set the i-th row use: void CVisDMatrix::SetRow(int r, const CVisDVector &v)
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