Change the Dynamic Parameters

Loading [MathJax]/extensions/TeX/newcommand.js

$\newcommand{\W}[1]{ \; #1 \; } \newcommand{\R}[1]{ {\rm #1} } \newcommand{\B}[1]{ {\bf #1} } \newcommand{\D}[2]{ \frac{\partial #1}{\partial #2} } \newcommand{\DD}[3]{ \frac{\partial^2 #1}{\partial #2 \partial #3} } \newcommand{\Dpow}[2]{ \frac{\partial^{#1}}{\partial {#2}^{#1}} } \newcommand{\dpow}[2]{ \frac{ {\rm d}^{#1}}{{\rm d}\, {#2}^{#1}} }$ This is cppad-20221105 documentation. Here is a link to its current documentation . Change the Dynamic Parameters
Syntax
f.new_dynamic(dynamic)

Purpose
Often one is only interested in computing derivatives with respect to a subset of arguments to a function. In this case, it is easier to make all the arguments to the function independent variables . It is more efficient, will use less memory and be faster, if the only the argument were are computing derivatives with respect to are independent variables and the other arguments are dynamic parameters. The new_dynamic method is used to change the value of the dynamic parameters in f .

f
The object f has prototype



    ADFun<Base> f

Note that the ADFun object f is not const.

dynamic
This argument has prototype



    const BaseVector& dynamic

(see BaseVector below). It specifies a new value for the independent dynamic parameters. It size must be the same as the size of the independent dynamic parameter vector in the call to Independent that started the recording for f ; see size_dyn_ind .

BaseVector
The type BaseVector must be a SimpleVector class with elements of type Base .

Taylor Coefficients
The Taylor coefficients computed by previous calls to f.Forward are lost after this operation; including the order zero coefficients (because they may depend on the dynamic parameters). In order words; f.size_order returns zero directly after f.new_dynamic is called.

Example
The file new_dynamic.cpp contains an example and test of this operation.

Input File: include/cppad/core/new_dynamic.hpp