e01ba_ad_f : NAG AD Library Routine Document, Mark 26

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)

Description

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

References

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:

ad_handle – a handle to the AD configuration data object, as created by x10aa_a1w_f.
m – $m$ , the number of data points.
x – $x (i)$ must be set to $x_{i}$ , the $i$ th data value of the independent variable $x$ , for $i = 1, 2, \dots, m$ .
y – $y (i)$ must be set to $y_{i}$ , the $i$ th data value of the dependent variable $y$ , for $i = 1, 2, \dots, m$ .
lamda – on exit: the value of $λ_{i}$ , the $i$ th knot, for $i = 1, 2, \dots, m + 4$ .
c – on exit: the coefficient $c_{i}$ of the B-spline $N_{i} (x)$ , for $i = 1, 2, \dots, m$ .
lck – the dimension of the arrays lamda and c.
wrk – workspace.
lwrk – the dimension of the array wrk.
ifail – on entry: ifail must be set to $0$ , $- 1 or 1$ . on exit: ifail = 0 unless the routine detects an error or a warning has been flagged (see Section 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.

Language	Source File	Data	Results
Fortan	e01ba_a1w_fe.f90	None	e01ba_a1w_fe.r
C++	e01ba_a1w_hcppe.cpp	None	e01ba_a1w_hcppe.r

NAG AD Library Routine Document

e01ba_a1w_f (dim1_spline_a1w)

▸▿ Contents

1

Purpose

2

Specification

3

Description

4

References

5

Arguments

6

Error Indicators and Warnings

7

Accuracy

8

Parallelism and Performance

9

Further Comments

10

Example

NAG AD Library Routine Document

e01ba_a1w_f (dim1_spline_a1w)

▸▿ Contents

1 Purpose

2 Specification

3 Description

4 References

5 Arguments

6 Error Indicators and Warnings

7 Accuracy

8 Parallelism and Performance

9 Further Comments

10 Example