swaprows <- function ( a, row1, row2 )

#*****************************************************************************80
#
## swaprows implements Row1 <-> Row2
#
#  Licensing:
#
#    Copyright 2016 James P. Howard, II
#
#    The computer code and data files on this web page are distributed under
#    https://opensource.org/licenses/BSD-2-Clause, the BSD-2-Clause license.
#
#  Modified:
#
#    10 February 2020
#
#  Author:
#
#    Original R code by James Howard;
#    Modifications by John Burkardt.
#
#  Reference:
#
#    James Howard,
#    Computational Methods for Numerical Analysis with R,
#    CRC Press, 2017,
#    ISBN13: 978-1-4987-2363-3.
#
{
  row.tmp  <- a[row1,]
  a[row1,] <- a[row2,]
  a[row2,] <- row.tmp

  return ( a )
}