PROGRAM f01zdfe ! F01ZDF Example Program Text ! Mark 23 Release. NAG Copyright 2011. ! .. Use Statements .. USE nag_library, ONLY : f01zdf, nag_wp, x04daf ! .. Implicit None Statement .. IMPLICIT NONE ! .. Parameters .. INTEGER, PARAMETER :: nin = 5, nout = 6 ! .. Local Scalars .. INTEGER :: i, ifail, kl, ku, lda, ldb, m, n ! .. Local Arrays .. COMPLEX (KIND=nag_wp), ALLOCATABLE :: a(:,:), b(:,:) ! .. Executable Statements .. WRITE (nout,*) 'F01ZDF Example Program Results' ! Skip heading in data file READ (nin,*) WRITE (nout,*) FLUSH (nout) READ (nin,*) m, n, kl, ku lda = n ldb = lda ALLOCATE (a(lda,n),b(ldb,n)) ! Read a banded matrix of size m by n. kl is the number of ! sub-diagonals, ku the number of super-diagonals. DO i = 1, n READ (nin,*) a(i,1:n) END DO ! Clear the packed matrix array B, so that no elements are ! unassigned when we print B later. b(1:(kl+ku+1),1:n) = (0.0E+0_nag_wp,0.0E+0_nag_wp) ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 ! Print the unpacked matrix CALL x04daf('G','X',n,n,a,lda,'Unpacked Matrix A:',ifail) WRITE (nout,*) FLUSH (nout) ! Convert to packed matrix form ifail = 0 CALL f01zdf('Pack',m,n,kl,ku,a,lda,b,ldb,ifail) ! Print the packed matrix ifail = 0 CALL x04daf('G','X',kl+ku+1,n,b,ldb,'Packed Matrix B:',ifail) END PROGRAM f01zdfe