PROGRAM g02byfe

!      G02BYF Example Program Text

!      Mark 23 Release. NAG Copyright 2011.

!      .. Use Statements ..
       USE nag_library, ONLY : g02bxf, g02byf, nag_wp, x04caf
!      .. Implicit None Statement ..
       IMPLICIT NONE
!      .. Parameters ..
       INTEGER, PARAMETER              :: nin = 5, nout = 6
!      .. Local Scalars ..
       INTEGER                         :: i, ifail, ldp, ldr, ldx, lwt, m, n,  &
                                          nx, ny
       CHARACTER (1)                   :: weight
!      .. Local Arrays ..
       REAL (KIND=nag_wp), ALLOCATABLE :: p(:,:), r(:,:), std(:), v(:,:),      &
                                          wk(:), wt(:), x(:,:), xbar(:)
       INTEGER, ALLOCATABLE            :: isz(:)
!      .. Executable Statements ..
       WRITE (nout,*) 'G02BYF Example Program Results'
       WRITE (nout,*)
       FLUSH (nout)

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

!      Read in the problem size
       READ (nin,*) weight, n, m

       IF (weight=='W' .OR. weight=='w') THEN
          lwt = n
       ELSE
          lwt = 0
       END IF
       ldp = m
       ldr = m
       ldx = n
       ALLOCATE (p(ldp,m),v(ldr,m),std(m),wk(m*m),wt(lwt),x(ldx,m),xbar(m), &
          isz(m),r(ldr,m))

!      Read in data
       READ (nin,*) (x(i,1:m),i=1,n)

!      Read in number of variables and variable flags for partial correlation
!      coefficients.
       READ (nin,*) ny, nx
       READ (nin,*) isz(1:m)

!      Calculate correlation matrix
       ifail = 0
       CALL g02bxf(weight,n,m,x,ldx,wt,xbar,std,v,ldr,r,ifail)

!      Calculate partial correlation matrix       
       ifail = 0
       CALL g02byf(m,ny,nx,isz,r,ldr,p,ldp,wk,ifail)

!      Display results
       ifail = 0
       CALL x04caf('Upper','Non-unit',m,m,r,ldr,'Correlation matrix',ifail)
       WRITE (nout,*)
       FLUSH (nout)
       ifail = 0
       CALL x04caf('Upper','Unit',ny,ny,p,ldp,'Partial Correlation matrix', &
          ifail)

    END PROGRAM g02byfe