Program f06ya_a1w_fe
! F06YA_A1W_F Example Program Text
! Mark 30.1 Release. NAG Copyright 2024.
! .. Use Statements ..
Use iso_c_binding, Only: c_ptr
Use nagad_library, Only: f06ya_a1w_f, nagad_a1w_get_derivative, &
nagad_a1w_inc_derivative, &
nagad_a1w_ir_interpret_adjoint_sparse, &
nagad_a1w_ir_register_variable, &
nagad_a1w_ir_remove, nagad_a1w_ir_zero_adjoints &
, nagad_a1w_w_rtype, x10aa_a1w_f, x10ab_a1w_f, &
x10za_a1w_f, Assignment (=)
Use nag_library, Only: nag_wp, x04caf
! .. Implicit None Statement ..
Implicit None
! .. Parameters ..
Integer, Parameter :: nin = 5, nout = 6
! .. Local Scalars ..
Type (c_ptr) :: ad_handle
Type (nagad_a1w_w_rtype) :: alpha, beta
Real (Kind=nag_wp) :: alphar, betar
Integer :: i, ifail, j, k, lda, ldb, ldc, m, n
! .. Local Arrays ..
Type (nagad_a1w_w_rtype), Allocatable :: a(:,:), b(:,:), c(:,:), &
c_in(:,:)
Real (Kind=nag_wp), Allocatable :: ar(:,:), br(:,:), cr(:,:), dr(:,:)
! .. Executable Statements ..
Write (nout,*) 'F06YA_A1W_F Example Program Results'
Write (nout,*)
! Skip heading in data file
Read (nin,*)
Read (nin,*) m, n, k
Read (nin,*) alphar, betar
alpha = alphar
beta = betar
lda = k
ldb = n
ldc = m
Allocate (a(lda,m),b(ldb,k),c(ldc,n),c_in(ldc,n))
Allocate (ar(lda,m),br(ldb,k),cr(ldc,n),dr(m,n))
! Read A from data file
Read (nin,*)(ar(i,1:m),i=1,k)
! Read B from data file
Read (nin,*)(br(i,1:k),i=1,n)
cr(1:m,1:n) = 1.0_nag_wp
c_in(1:m,1:n) = cr(1:m,1:n)
! Create AD tape
Call x10za_a1w_f
! Create AD configuration data object
ifail = 0
Call x10aa_a1w_f(ad_handle,ifail)
Call nagad_a1w_ir_register_variable(alpha)
Call nagad_a1w_ir_register_variable(beta)
a = ar
b = br
c = c_in
ifail = 0
Call f06ya_a1w_f(ad_handle,'T','T',m,n,k,alpha,a,lda,b,ldb,beta,c,ldc, &
ifail)
Write (nout,*)
Write (nout,*) 'Product solution C = beta*C + alpha*A^T*B^T:'
Write (nout,*)
cr = c
! Print solution
ifail = 0
Call x04caf('G','N',m,n,cr,ldc,'updated C',ifail)
Write (nout,*)
Write (nout,*) ' Derivatives calculated: First order adjoints'
Write (nout,*) ' Computational mode : algorithmic'
Write (nout,*)
Write (nout,*) ' Derivatives of C w.r.t. alpha and beta'
Write (nout,*)
! Setup evaluation of derivatives via adjoints
Do i = 1, m
Do j = 1, n
Call nagad_a1w_ir_zero_adjoints
Call nagad_a1w_inc_derivative(c(i,j),1.0_nag_wp)
ifail = 0
Call nagad_a1w_ir_interpret_adjoint_sparse(ifail)
! Get derivatives
cr(i,j) = nagad_a1w_get_derivative(alpha)
dr(i,j) = nagad_a1w_get_derivative(beta)
End Do
End Do
Call x04caf('General',' ',m,n,cr,ldc,' dC/dalpha',ifail)
Write (nout,*)
Call x04caf('General',' ',m,n,dr,m,' dC/dbeta',ifail)
! Remove computational data object and tape
Call x10ab_a1w_f(ad_handle,ifail)
Call nagad_a1w_ir_remove
End Program f06ya_a1w_fe