PROGRAM g02bufe ! G02BUF Example Program Text ! Mark 23 Release. NAG Copyright 2011. ! .. 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 (nin,*) ! 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 READ (nin,*) wt(1:n) END IF READ (nin,*) (x(i,1:m),i=1,n) ! 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