NAG Library Manual, Mark 29.3
Interfaces:  FL   CL   CPP   AD
```    Program g02bufe

!     G02BUF Example Program Text

!     Mark 29.3 Release. NAG Copyright 2023.

!     .. Use Statements ..
Use nag_library, Only: dscal, g02buf, nag_wp, x04ccf
!     .. Implicit None Statement ..
Implicit None
!     .. Parameters ..
Real (Kind=nag_wp), Parameter    :: one = 1.0_nag_wp
Integer, Parameter               :: inc1 = 1, nin = 5, nout = 6
!     .. Local Scalars ..
Real (Kind=nag_wp)               :: alpha, sw
Integer                          :: i, ifail, lc, ldx, lwt, m, n
Character (1)                    :: mean, weight
!     .. Local Arrays ..
Real (Kind=nag_wp), Allocatable  :: c(:), wmean(:), wt(:), x(:,:)
!     .. Executable Statements ..
Write (nout,*) 'G02BUF Example Program Results'
Write (nout,*)
Flush (nout)

!     Skip heading in data file

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

If (weight=='W' .Or. weight=='w') Then
lwt = n
Else
lwt = 0
End If
ldx = n
lc = (m*m+m)/2
Allocate (wt(lwt),x(ldx,m),wmean(m),c(lc))

!     Read in data
If (lwt>0) Then
End If

!     Calculate sums of squares and cross-products matrix
ifail = 0
Call g02buf(mean,weight,n,m,x,ldx,wt,sw,wmean,c,ifail)

!     Display results
Write (nout,*) 'Means'
Write (nout,99999) wmean(1:m)
Write (nout,*)
Write (nout,*) 'Weights'
Write (nout,99999) wt(1:n)
Write (nout,*)
Flush (nout)
ifail = 0
Call x04ccf('Upper','Non-unit',m,c,'Sums of squares and cross-products', &
ifail)

!     Convert the sums of squares and cross-products to a variance matrix
If (sw>one) Then
alpha = one/(sw-one)
!       The NAG name equivalent of dscal is f06edf
Call dscal(lc,alpha,c,inc1)
Write (nout,*)
Flush (nout)
ifail = 0
Call x04ccf('Upper','Non-unit',m,c,'Variance matrix',ifail)
End If

99999 Format (1X,6F14.4)
End Program g02bufe
```