Program g05pyfe

!     G05PYF Example Program Text

!     Mark 30.1 Release. NAG Copyright 2024.

!     .. Use Statements ..
      Use nag_library, Only: g05kff, g05pyf, nag_wp, x04caf
!     .. Implicit None Statement ..
      Implicit None
!     .. Parameters ..
      Integer, Parameter               :: lseed = 1, nin = 5, nout = 6
!     .. Local Scalars ..
      Real (Kind=nag_wp)               :: eps
      Integer                          :: genid, ifail, ldc, lstate, n, subid
!     .. Local Arrays ..
      Real (Kind=nag_wp), Allocatable  :: c(:,:), d(:)
      Integer                          :: seed(lseed)
      Integer, Allocatable             :: state(:)
!     .. Executable Statements ..
      Write (nout,*) 'G05PYF Example Program Results'
      Write (nout,*)
      Flush (nout)

!     Skip heading in data file
      Read (nin,*)

!     Read in the base generator information and seed
      Read (nin,*) genid, subid, seed(1)

!     Initial call to initializer to get size of STATE array
      lstate = 0
      Allocate (state(lstate))
      ifail = 0
      Call g05kff(genid,subid,seed,lseed,state,lstate,ifail)

!     Reallocate STATE
      Deallocate (state)
      Allocate (state(lstate))

!     Initialize the generator to a repeatable sequence
      ifail = 0
      Call g05kff(genid,subid,seed,lseed,state,lstate,ifail)

!     Read in the problem size and tolerance
      Read (nin,*) n, eps

      ldc = n
      Allocate (c(ldc,n),d(n))

!     Read in the eigenvalues
      Read (nin,*) d(1:n)

!     Generate the correlation matrix
      ifail = 0
      Call g05pyf(n,d,eps,state,c,ldc,ifail)

!     Display the results
      ifail = 0
      Call x04caf('General',' ',n,n,c,ldc,'Correlation Matrix',ifail)

    End Program g05pyfe