program main

!*****************************************************************************80
!
!! MAIN is the main program for BLAS1_C_PRB.
!
!  Discussion:
!
!    BLAS1_C_PRB tests the BLAS1 single precision complex routines.
!
!  Modified:
!
!    12 April 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  call timestamp ( )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'BLAS1_C_PRB:'
  write ( *, '(a)' ) '  FORTRAN90 version'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Test the single precision complex arithmetic'
  write ( *, '(a)' ) '  version of the BLAS1,'
  write ( *, '(a)' ) '  the Level 1 Basic Linear Algebra Subprograms.'
 
  call test01
  call test02
  call test03
  call test04
  call test05
  call test06
  call test07
  call test08
  call test09

  call test10
  call test11
  call test12
  call test13
  call test14
  call test15
  call test16
  call test17
 
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'BLAS1_C_PRB:'
  write ( *, '(a)' ) '  Normal end of execution.'

  write ( *, '(a)' ) ' '
  call timestamp ( )

  stop
end
subroutine test01

!*****************************************************************************80
!
!! TEST01 tests CABS1.
!
!  Modified:
!
!    15 May 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  complex c
  complex c4_uniform_01
  real c_norm
  real cabs1
  integer i
  integer :: seed = 123456789

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST01'
  write ( *, '(a)' ) &
    '  CABS1 returns the L1 norm of a single precision complex number.'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '      Real      Imaginary              '
  write ( *, '(a)' ) '      Part      Part           CABS1(Z)'
  write ( *, '(a)' ) ' '

  do i = 1, 10

    c = 5.0E+00 * c4_uniform_01 ( seed )

    c_norm = cabs1 ( c )

    write ( *, '(2x,2f10.4,5x,f10.4)' ) c, c_norm

  end do

  return
end
subroutine test02

!*****************************************************************************80
!
!! TEST02 tests CABS2.
!
!  Modified:
!
!    11 April 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  complex c
  complex c4_uniform_01
  real c_norm
  real cabs2
  integer i
  integer :: seed = 123456789

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST02'
  write ( *, '(a)' ) &
    '  CABS2 returns the L2 norm of a single precision complex number.'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '      Real      Imaginary              '
  write ( *, '(a)' ) '      Part      Part           CABS2(Z)'
  write ( *, '(a)' ) ' '

  do i = 1, 10

    c = 5.0E+00 * c4_uniform_01 ( seed )

    c_norm = cabs2 ( c )

    write ( *, '(2x,2f10.4,5x,f10.4)' ) c, c_norm

  end do

  return
end
subroutine test03

!*****************************************************************************80
!
!! TEST03 tests CAXPY.
!
!  Modified:
!
!    26 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: n = 5

  integer i
  complex s
  complex, dimension ( n ) :: x = (/ &
    (  2.0E+00, -1.0E+00 ), &
    ( -4.0E+00, -2.0E+00 ), &
    (  3.0E+00,  1.0E+00 ), &
    (  2.0E+00,  2.0E+00 ), &
    ( -1.0E+00, -1.0E+00 ) /)
  complex, dimension ( n ) :: y = (/ &
    ( -1.0E+00,  0.0E+00 ), &
    (  0.0E+00, -3.0E+00 ), &
    (  4.0E+00,  0.0E+00 ), &
    ( -3.0E+00,  4.0E+00 ), &
    ( -2.0E+00,  0.0E+00 ) /)

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST03'
  write ( *, '(a)' ) '  CAXPY adds a multiple of '
  write ( *, '(a)' ) '  one single precision complex vector to another.'
 
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  X = '
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, x(i)
  end do

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Y = '
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, y(i)
  end do

  s = ( 0.50E+00, -1.00E+00 )

  write ( *, '(a)' ) ' '
  write ( *, '(a,2g14.6)' ) '  The scalar multiplier is: ', s

  call caxpy ( n, s, x, 1, y, 1 )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  A * X + Y = '
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2f10.6)' ) i, y(i)
  end do

  return
end
subroutine test04

!*****************************************************************************80
!
!! TEST04 tests CCOPY.
!
!  Modified:
!
!    24 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  complex a(5,5)
  integer i
  integer j
  complex x(10)
  complex y(10)

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST04'
  write ( *, '(a)' ) '  CCOPY copies a single precision complex vector.'
 
  do i = 1, 10
    x(i) = cmplx ( 10 * i, i )
  end do

  do i = 1, 10
    y(i) = cmplx ( 20 * i, 2 * i )
  end do

  do i = 1, 5
    do j = 1, 5
      a(i,j) = cmplx ( 10 * i,  j )
    end do
  end do

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  X = '
  write ( *, '(a)' ) ' '
  do i = 1, 10
    write ( *, '(2x,i6,2g14.6)' ) i, x(i)
  end do
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Y = '
  write ( *, '(a)' ) ' '
  do i = 1, 10
    write ( *, '(2x,i6,2g14.6)' ) i, y(i)
  end do
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  A = '
  write ( *, '(a)' ) ' '
  do i = 1, 5
    write ( *, '(2x,10f7.1)' ) a(i,1:5)
  end do

  call ccopy ( 5, x, 1, y, 1 )
  write ( *, '(a)' ) ' '
  write ( *, '(a,f8.4,a)' ) '  CCOPY ( 5, X, 1, Y, 1 )'
  write ( *, '(a)' ) ' '
  do i = 1, 10
    write ( *, '(2x,i6,2g14.6)' ) i, y(i)
  end do

  do i = 1, 10
    y(i) = cmplx ( 20 * i, 2 * i )
  end do

  call ccopy ( 3, x, 2, y, 3 )
  write ( *, '(a)' ) ' '
  write ( *, '(a,f8.4,a)' ) '  CCOPY ( 3, X, 2, Y, 3 )'
  write ( *, '(a)' ) ' '
  do i = 1, 10
    write ( *, '(2x,i6,2g14.6)' ) i, y(i)
  end do

  call ccopy ( 5, x, 1, a, 1 )
  write ( *, '(a)' ) ' '
  write ( *, '(a,f8.4,a)' ) '  CCOPY ( 5, X, 1, A, 1 )'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  A = '
  write ( *, '(a)' ) ' '
  do i = 1, 5
    write ( *, '(2x,10f7.1)' ) a(i,1:5)
  end do

  do i = 1, 5
    do j = 1, 5
      a(i,j) = cmplx ( 10 * i,  j )
    end do
  end do

  call ccopy ( 5, x, 2, a, 5 )
  write ( *, '(a)' ) ' '
  write ( *, '(a,f8.4,a)' ) '  CCOPY ( 5, X, 2, A, 5 )'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  A = '
  write ( *, '(a)' ) ' '
  do i = 1, 5
    write ( *, '(2x,10f7.1)' ) a(i,1:5)
  end do

  return
end
subroutine test05

!*****************************************************************************80
!
!! TEST05 tests CDOTC.
!
!  Modified:
!
!    26 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: n = 5

  complex cdotc
  integer i
  complex x_norm
  complex xy_dot
  complex, dimension ( n ) :: x = (/ &
    (  2.0E+00, -1.0E+00 ), &
    ( -4.0E+00, -2.0E+00 ), &
    (  3.0E+00,  1.0E+00 ), &
    (  2.0E+00,  2.0E+00 ), &
    ( -1.0E+00, -1.0E+00 ) /)
  complex, dimension ( n ) :: y = (/ &
    ( -1.0E+00,  0.0E+00 ), &
    (  0.0E+00, -3.0E+00 ), &
    (  4.0E+00,  0.0E+00 ), &
    ( -3.0E+00,  4.0E+00 ), &
    ( -2.0E+00,  0.0E+00 ) /)

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST05'
  write ( *, '(a)' ) '  CDOTC computes the conjugated dot product of '
  write ( *, '(a)' ) '  two single precision complex vectors.'
 
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  X = '
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, x(i)
  end do

  x_norm = cdotc ( n, x, 1, x, 1 )
  
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  The square of the norm of X, computed as'
  write ( *, '(a,f10.4,2x,f10.4)' ) '  CDOTC(X,X) = ', x_norm

  xy_dot = cdotc ( n, x, 1, y, 1 )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Y = '
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, y(i)
  end do

  write ( *, '(a)' ) ' '
  write ( *, '(a,f10.4,2x,f10.4)' ) '  The dot product X.Y* is ', xy_dot

  return
end
subroutine test06

!*****************************************************************************80
!
!! TEST06 tests CDOTU.
!
!  Modified:
!
!    26 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: n = 5

  complex cdotu
  integer i
  complex x_norm
  complex xy_dot
  complex, dimension ( n ) :: x = (/ &
    (  2.0E+00, -1.0E+00 ), &
    ( -4.0E+00, -2.0E+00 ), &
    (  3.0E+00,  1.0E+00 ), &
    (  2.0E+00,  2.0E+00 ), &
    ( -1.0E+00, -1.0E+00 ) /)
  complex, dimension ( n ) :: y = (/ &
    ( -1.0E+00,  0.0E+00 ), &
    (  0.0E+00, -3.0E+00 ), &
    (  4.0E+00,  0.0E+00 ), &
    ( -3.0E+00,  4.0E+00 ), &
    ( -2.0E+00,  0.0E+00 ) /)

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST06'
  write ( *, '(a)' ) '  CDOTU computes the unconjugated dot product of '
  write ( *, '(a)' ) '  two single precision complex vectors.'
 
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  X = '
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, x(i)
  end do

  x_norm = cdotu ( n, x, 1, x, 1 )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  The unconjugated dot product ( X dot X )'
  write ( *, '(a)' ) '  (which is NOT the square of the norm of X!):'
  write ( *, '(a,f10.4,2x,f10.4)' ) '  CDOTU(X,X) = ', x_norm

  xy_dot = cdotu ( n, x, 1, y, 1 )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Y = '
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, y(i)
  end do

  write ( *, '(a)' ) ' '
  write ( *, '(a,f10.4,2x,f10.4)' ) '  The dot product ( X dot Y ) is ', xy_dot

  return
end
subroutine test07

!*****************************************************************************80
!
!! TEST07 tests CMACH.
!
!  Discussion:
!
!    The CMACH routine is not part of the official BLAS release.
!    It was used for the testing routines.
!
!  Modified:
!
!    24 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  real cmach
  integer job

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST07'
  write ( *, '(a)' ) '  CMACH computes several machine-dependent'
  write ( *, '(a)' ) '  single precision complex arithmetic parameters.'

  write ( *, '(a)' ) ' '
  write ( *, * ) '  CMACH(1)  = machine epsilon = ', cmach ( 1 )
  write ( *, * ) '  CMACH(2)  = a tiny value    = ', cmach ( 2 )
  write ( *, * ) '  CMACH(3)  = a huge value    = ', cmach ( 3 )

  return
end
subroutine test08

!*****************************************************************************80
!
!! TEST08 tests CROTG.
!
!  Modified:
!
!    15 May 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  complex a
  complex b
  real c
  complex c4_uniform_01
  complex r
  complex s
  complex sa
  complex sb
  integer seed
  integer test
  integer, parameter :: test_num = 5

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST08'
  write ( *, '(a)' ) &
    '  CROTG generates a single precision complex Givens rotation'
  write ( *, '(a)' ) '    (  C  S ) * ( A ) = ( R )'
  write ( *, '(a)' ) '    ( -S  C )   ( B )   ( 0 )'
  write ( *, '(a)' ) ' '

  seed = 123456789

  do test = 1, test_num

    a = c4_uniform_01 ( seed )
    b = c4_uniform_01 ( seed )

    sa = a
    sb = b

    call crotg ( sa, sb, c, s )

    r = sa

    write ( *, '(a)' ) ' '
    write ( *, '(a,2g14.6)' ) '  A =  ', a
    write ( *, '(a,2g14.6)' ) '  B =  ', b
    write ( *, '(a, g14.6)' ) '  C =  ', c
    write ( *, '(a,2g14.6)' ) '  S =  ', s
    write ( *, '(a,2g14.6)' ) '  R =  ', r
    write ( *, '(a,2g14.6)' ) '         C *A+S*B = ',          c   * a + s * b
    write ( *, '(a,2g14.6)' ) '  -conjg(S)*A+C*B = ', -conjg ( s ) * a + c * b

  end do

  return
end
subroutine test09

!*****************************************************************************80
!
!! TEST09 tests CSCAL.
!
!  Modified:
!
!    24 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: n = 6

  complex da
  integer i
  complex x(n)

  do i = 1, n
    x(i) = cmplx ( 10 * i, i )
  end do

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST09'
  write ( *, '(a)' ) '  CSCAL multiplies a single precision complex scalar'
  write ( *, '(a)' ) '  times a single precision vector.'

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  X = '
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, x(i)
  end do

  da = cmplx ( 5.0E+00, 0.0E+00 )
  call cscal ( n, da, x, 1 )
  write ( *, '(a)' ) ' '
  write ( *, '(a,2f8.4,a)' ) '  CSCAL ( N, (', da, '), X, 1 )'
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, x(i)
  end do

  do i = 1, n
    x(i) = cmplx ( 10 * i, i )
  end do

  da = cmplx ( -2.0E+00, 1.0E+00 )
  call cscal ( 3, da, x, 2 )
  write ( *, '(a)' ) ' '
  write ( *, '(a,2f8.4,a)' ) '  CSCAL ( 3, (', da, '), X, 2 )'
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, x(i)
  end do

  return
end
subroutine test10

!*****************************************************************************80
!
!! TEST10 tests CSIGN1.
!
!  Modified:
!
!    24 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  complex c1
  complex c2
  complex c3
  complex c4_uniform_01
  complex csign1
  integer i
  integer :: seed = 123456789

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST10'
  write ( *, '(a)' ) '  CSIGN1 ( C1, C2 ) transfers the sign of '
  write ( *, '(a)' ) '  a single precision complex C2'
  write ( *, '(a)' ) '  to the CABS1 magnitude of a single precision complex C1.'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) &
    '           C1                    C2                    C3'
  write ( *, '(a)' ) &
    '  --------------------  --------------------  --------------------'
  write ( *, '(a)' ) ' '

  do i = 1, 10

    c1 = 5.0E+00 * c4_uniform_01 ( seed )
    c2 = 5.0E+00 * c4_uniform_01 ( seed )
    c3 = csign1 ( c1, c2 )

    write ( *, '(2x,2f10.4,2x,2f10.4,2x,2f10.4)' ) c1, c2, c3

  end do

  return
end
subroutine test11

!*****************************************************************************80
!
!! TEST11 tests CSIGN2.
!
!  Modified:
!
!    11 April 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  complex c1
  complex c2
  complex c3
  complex c4_uniform_01
  complex csign2
  integer i
  integer :: seed = 123456789

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST11'
  write ( *, '(a)' ) '  CSIGN2 ( C1, C2 ) transfers the sign of'
  write ( *, '(a)' ) '  a single precision complex C2'
  write ( *, '(a)' ) '  to the CABS2 magnitude of a single precision complex C1.'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) &
    '           C1                    C2                    C3'
  write ( *, '(a)' ) &
    '  --------------------  --------------------  --------------------'
  write ( *, '(a)' ) ' '

  do i = 1, 10

    c1 = 5.0E+00 * c4_uniform_01 ( seed )
    c2 = 5.0E+00 * c4_uniform_01 ( seed )
    c3 = csign2 ( c1, c2 )

    write ( *, '(2x,2f10.4,2x,2f10.4,2x,2f10.4)' ) c1, c2, c3

  end do

  return
end
subroutine test12

!*****************************************************************************80
!
!! TEST12 tests CSROT.
!
!  Modified:
!
!    24 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: n = 6

  real c
  integer i
  real s
  complex x(n)
  complex y(n)

  do i = 1, n
    x(i) = cmplx ( 10 * i, i )
  end do

  do i = 1, n
    y(i) = cmplx ( 20 * i, 2 * i )
  end do

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST12'
  write ( *, '(a)' ) '  CSROT carries out a Givens rotation'
  write ( *, '(a)' ) '  on a single precision complex vector.'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  X and Y'
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,2f10.1,2x,2f10.1)' ) i, x(i), y(i)
  end do

  c = 0.5E+00
  s = sqrt ( 1.0E+00 - c * c )
  call csrot ( n, x, 1, y, 1, c, s )
  write ( *, '(a)' ) ' '
  write ( *, '(a,f8.4,a,f8.4,a)' ) '  CSROT ( N, X, 1, Y, 1, ', c, ',', s, ' )'
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,2f10.1,2x,2f10.1)' ) i, x(i), y(i)
  end do

  return
end
subroutine test13

!*****************************************************************************80
!
!! TEST13 tests CSSCAL.
!
!  Modified:
!
!    24 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: n = 6

  real da
  integer i
  complex x(n)

  do i = 1, n
    x(i) = cmplx ( 10 * i, i )
  end do

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST13'
  write ( *, '(a)' ) '  CSSCAL multiplies a single precision real scalar'
  write ( *, '(a)' ) '  times a single precision complex vector.'

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  X = '
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, x(i)
  end do

  da = 5.0E+00
  call csscal ( n, da, x, 1 )
  write ( *, '(a)' ) ' '
  write ( *, '(a,f8.4,a)' ) '  CSSCAL ( N, ', da, ', X, 1 )'
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, x(i)
  end do

  do i = 1, n
    x(i) = cmplx ( 10 * i, i )
  end do

  da = -2.0E+00
  call csscal ( 3, da, x, 2 )
  write ( *, '(a)' ) ' '
  write ( *, '(a,f8.4,a)' ) '  CSSCAL ( 3, ', da, ', X, 2 )'
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, x(i)
  end do

  return
end
subroutine test14

!*****************************************************************************80
!
!! TEST14 tests CSWAP.
!
!  Modified:
!
!    24 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: n = 5

  integer i
  complex x(n)
  complex y(n)

  do i = 1, n
    x(i) = cmplx ( 10 * i, i )
  end do

  do i = 1, n
    y(i) = cmplx ( 20 * i, 2 * i )
  end do

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST14'
  write ( *, '(a)' ) '  CSWAP swaps two single precision complex vectors.'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  X and Y'
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,2f7.1,2x,2f7.1)' ) i, x(i), y(i)
  end do

  call cswap ( n, x, 1, y, 1 )
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  CSWAP ( N, X, 1, Y, 1 )'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  X and Y'
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,2f7.1,2x,2f7.1)' ) i, x(i), y(i)
  end do

  do i = 1, n
    x(i) = cmplx ( 10 * i, i )
  end do

  do i = 1, n
    y(i) = cmplx ( 20 * i, 2 * i )
  end do

  call cswap ( 3, x, 2, y, 1 )
  write ( *, '(a)' ) ' '
  write ( *, '(a,f8.4,a)' ) '  CSWAP ( 3, X, 2, Y, 1 )'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  X and Y'
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '(2x,i6,2x,2f7.1,2x,2f7.1)' ) i, x(i), y(i)
  end do

  return
end
subroutine test15

!*****************************************************************************80
!
!! TEST15 tests ICAMAX.
!
!  Modified:
!
!    26 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: n = 5

  real cabs1
  integer i
  integer incx
  integer icamax
  complex, dimension ( n ) :: x = (/ &
    (  2.0E+00, -1.0E+00 ), &
    ( -4.0E+00, -2.0E+00 ), &
    (  3.0E+00,  1.0E+00 ), &
    (  2.0E+00,  2.0E+00 ), &
    ( -1.0E+00, -1.0E+00 ) /)

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST15'
  write ( *, '(a)' ) '  ICAMAX returns the index of the entry of '
  write ( *, '(a)' ) '  maximum magnitude in a single precision complex vector.'
 
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  The entries and CABS1 magnitudes:'
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '( 2x,i6, 2f8.4,5x,f8.4 )' ) i, x(i), cabs1 ( x(i) )
  end do

  incx = 1

  i = icamax ( n, x, incx )

  write ( *, '(a)' ) ' '
  write ( *, '(a,i6)'    ) '  The index of maximum magnitude = ', i

  return
end
subroutine test16

!*****************************************************************************80
!
!! TEST16 tests SCASUM.
!
!  Modified:
!
!    26 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: ma = 5
  integer, parameter :: na = 4
  integer, parameter :: nx = 8

  complex, dimension ( ma, na ) :: a = reshape ( (/ &
    ( -3.0E+00,  4.0E+00 ), &
    (  2.0E+00,  0.0E+00 ), &
    (  3.0E+00, -4.0E+00 ), &
    (  2.0E+00,  0.0E+00 ), &
    (  2.0E+00, -1.0E+00 ), &
    ( -1.0E+00,  1.0E+00 ), &
    (  0.0E+00,  5.0E+00 ), &
    ( -4.0E+00, -2.0E+00 ), &
    ( -4.0E+00,  1.0E+00 ), &
    ( -4.0E+00, -3.0E+00 ), &
    (  0.0E+00, -2.0E+00 ), &
    (  1.0E+00,  3.0E+00 ), &
    ( -3.0E+00,  3.0E+00 ), &
    ( -3.0E+00,  3.0E+00 ), &
    ( -1.0E+00, -2.0E+00 ), &
    ( -1.0E+00,  2.0E+00 ), &
    (  2.0E+00, -4.0E+00 ), &
    (  0.0E+00, -1.0E+00 ), &
    (  0.0E+00, -1.0E+00 ), &
    ( -2.0E+00,  4.0E+00 ) /), (/ ma, na /) )
  integer i
  real scasum
  complex, dimension ( nx ) :: x = (/ &
    (  2.0E+00, -1.0E+00 ), &
    ( -4.0E+00, -2.0E+00 ), &
    (  3.0E+00,  1.0E+00 ), &
    (  2.0E+00,  2.0E+00 ), &
    ( -1.0E+00, -1.0E+00 ), &
    ( -1.0E+00,  0.0E+00 ), &
    (  0.0E+00, -3.0E+00 ), &
    (  4.0E+00,  0.0E+00 ) /)

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST16'
  write ( *, '(a)' ) '  SCASUM adds the absolute values of elements '
  write ( *, '(a)' ) '  of a single precision complex vector.'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  X = '
  write ( *, '(a)' ) ' '
  do i = 1, nx
    write ( *, '(2x,i6,2x,f6.1,2x,f6.1)' ) i, x(i)
  end do

  write ( *, '(a)' ) ' '
  write ( *, '(a,g14.6)' ) '  SCASUM ( NX,   X, 1    ) = ', &
    scasum ( nx,   x, 1 )
  write ( *, '(a,g14.6)' ) '  SCASUM ( NX/2, X, 2    ) = ', &
    scasum ( nx/2, x, 2 )
  write ( *, '(a,g14.6)' ) '  SCASUM ( 2,    X, NX/2 ) = ', &
    scasum ( 2,    x, nx/2 )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Demonstrate with a matrix A:'
  write ( *, '(a)' ) ' '
  do i = 1, ma
    write ( *, '(4(2x,f6.1,2x,f6.1))' ) a(i,1:na)
  end do

  write ( *, '(a)' ) ' '
  write ( *, '(a,g14.6)' ) '  SCASUM ( MA, A(1,2), 1 )   = ', &
    scasum ( ma, a(1,2), 1 )
  write ( *, '(a,g14.6)' ) '  SCASUM ( NA, A(2,1), MA ) = ', &
    scasum ( na, a(2,1), ma )

  return
end
subroutine test17

!*****************************************************************************80
!
!! TEST17 tests SCNRM2.
!
!  Modified:
!
!    26 February 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: n = 5

  integer i
  integer incx
  real norm
  real scnrm2
  complex, dimension ( n ) :: x = (/ &
    (  2.0E+00, -1.0E+00 ), &
    ( -4.0E+00, -2.0E+00 ), &
    (  3.0E+00,  1.0E+00 ), &
    (  2.0E+00,  2.0E+00 ), &
    ( -1.0E+00, -1.0E+00 ) /)

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST17'
  write ( *, '(a)' ) '  SCNRM2 returns the Euclidean norm of a'
  write ( *, '(a)' ) '  single precision complex vector.'
 
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  The vector X:'
  write ( *, '(a)' ) ' '
  do i = 1, n
    write ( *, '( 2x, i6, 2x, f6.1, 2x, f6.1 )' ) i, x(i)
  end do

  incx = 1
  norm = scnrm2 ( n, x, incx )

  write ( *, '(a)' ) ' '
  write ( *, '(a,g14.6)'    ) '  The L2 norm of X is ', norm

  return
end
function c4_uniform_01 ( seed )

!*****************************************************************************80
!
!! C4_UNIFORM_01 returns a unit pseudorandom C4.
!
!  Discussion:
!
!    The angle should be uniformly distributed between 0 and 2 * PI,
!    the square root of the radius uniformly distributed between 0 and 1.
!
!    This results in a uniform distribution of values in the unit circle.
!
!  Modified:
!
!    15 March 2005
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input/output, integer SEED, the "seed" value, which should NOT be 0.
!    On output, SEED has been updated.
!
!    Output, complex c4_uniform_01, a pseudorandom complex value.
!
  implicit none

  complex c4_uniform_01
  real r
  integer k
  real, parameter :: pi = 3.1415926E+00
  integer seed
  real theta

  k = seed / 127773

  seed = 16807 * ( seed - k * 127773 ) - k * 2836

  if ( seed < 0 ) then
    seed = seed + 2147483647
  end if

  r = sqrt ( real ( real ( seed, kind = 8 ) * 4.656612875D-10 ) )

  k = seed / 127773

  seed = 16807 * ( seed - k * 127773 ) - k * 2836

  if ( seed < 0 ) then
    seed = seed + 2147483647
  end if

  theta = 2.0E+00 * pi * real ( real ( seed, kind = 8 ) * 4.656612875D-10 )

  c4_uniform_01 = r * cmplx ( cos ( theta ), sin ( theta ) )

  return
end
subroutine timestamp ( )

!*****************************************************************************80
!
!! TIMESTAMP prints the current YMDHMS date as a time stamp.
!
!  Example:
!
!    May 31 2001   9:45:54.872 AM
!
!  Modified:
!
!    26 February 2005
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    None
!
  implicit none

  character ( len = 8 ) ampm
  integer d
  integer h
  integer m
  integer mm
  character ( len = 9 ), parameter, dimension(12) :: month = (/ &
    'January  ', 'February ', 'March    ', 'April    ', &
    'May      ', 'June     ', 'July     ', 'August   ', &
    'September', 'October  ', 'November ', 'December ' /)
  integer n
  integer s
  integer values(8)
  integer y

  call date_and_time ( values = values )

  y = values(1)
  m = values(2)
  d = values(3)
  h = values(5)
  n = values(6)
  s = values(7)
  mm = values(8)

  if ( h < 12 ) then
    ampm = 'AM'
  else if ( h == 12 ) then
    if ( n == 0 .and. s == 0 ) then
      ampm = 'Noon'
    else
      ampm = 'PM'
    end if
  else
    h = h - 12
    if ( h < 12 ) then
      ampm = 'PM'
    else if ( h == 12 ) then
      if ( n == 0 .and. s == 0 ) then
        ampm = 'Midnight'
      else
        ampm = 'AM'
      end if
    end if
  end if

  write ( *, '(a,1x,i2,1x,i4,2x,i2,a1,i2.2,a1,i2.2,a1,i3.3,1x,a)' ) &
    trim ( month(m) ), d, y, h, ':', n, ':', s, '.', mm, trim ( ampm )

  return
end