NAG AD Library Routine Document

e01ba_a1w_f (dim1_spline_a1w)


Note: _a1w_ denotes that first order adjoints are computed in working precision; this has the corresponding argument type nagad_a1w_w_rtype. Further implementations, for example for higher order differentiation or using the tangent linear approach, may become available at later marks of the NAG AD Library. The method of codifying AD implementations in routine name and corresponding argument types is described in the NAG AD Library Introduction.

1
Purpose

e01ba_a1w_f is the adjoint version of the primal routine e01baf .

2
Specification

Fortran Interface
Subroutine e01ba_a1w_f (ad_handle, m, x, y, lamda, c, lck, wrk, lwrk, ifail)
Integer, Intent (In):: m, lck, lwrk
Integer, Intent (Inout):: ifail
Type (nagad_a1w_w_rtype), Intent (In):: x(m), y(m)
Type (nagad_a1w_w_rtype), Intent (Out):: lamda(lck), c(lck), wrk(lwrk)
Type (c_ptr), Intent (In):: ad_handle
C++ Header Interface
#include <nagad.h>
void e01ba_a1w_f_ (void *&ad_handle, const Integer &m, nagad_a1w_w_rtype x[], nagad_a1w_w_rtype y[], nagad_a1w_w_rtype lamda[], nagad_a1w_w_rtype c[], const Integer &lck, nagad_a1w_w_rtype wrk[], const Integer &lwrk, Integer &ifail)

3
Description

e01baf determines a cubic spline interpolant to a given set of data. For further information see Section 3 in the documentation for e01baf .

4
References

None.

5
Arguments

e01ba_a1w_f provides access to all the arguments available in the primal routine. There are also additional arguments specific to AD. A tooltip popup for each argument can be found by hovering over the argument name in Section 2 and a summary of the arguments are provided below:

6
Error Indicators and Warnings

e01ba_a1w_f preserves all error codes from e01baf and in addition can return:
ifail=-89
An unexpected AD error has been triggered by this routine. Please contact NAG.
See Section 5.2 in the NAG AD Library Introduction for further information.
ifail=-899
Dynamic memory allocation failed for AD.
See Section 5.1 in the NAG AD Library Introduction for further information.

7
Accuracy

Not applicable.

8
Parallelism and Performance

e01ba_a1w_f is not threaded in any implementation.

9
Further Comments

None.

10
Example

The following examples are variants of the example for e01baf , modified to demonstrate calling the NAG AD Library.
LanguageSource FileDataResults
Fortane01ba_a1w_fe.f90Nonee01ba_a1w_fe.r
C++e01ba_a1w_hcppe.cppNonee01ba_a1w_hcppe.r