rowSwap -- interchange rows

• Usage:

  rowSwap(m,i,j)

• Inputs:
  • m, a mutable matrix
  • i, an integer
  • j, an integer
• Consequences:

  • Interchanges the i th and j th rows of m

i1 : m = mutableMatrix matrix{{1,2,3},{4,5,6}}

o1 = | 1 2 3 |
     | 4 5 6 |

o1 : MutableMatrix

i2 : rowSwap(m,0,1)

o2 = | 4 5 6 |
     | 1 2 3 |

o2 : MutableMatrix

i3 : m

o3 = | 4 5 6 |
     | 1 2 3 |

o3 : MutableMatrix