Using parameters with atomic functions about cppad

[bradbell]

I am considering defining a new atomic function interface that would be easier to use and have more features. See the heading Atomic on
https://coin-or.github.io/CppAD/doc/wish_list.htm#Atomic

Note that this is currently a collection of thoughts about atomic functions and not as yet a plan.

[joaoleal]

Great! :)
I see that CppAD would potentialy provide the atomic function with the indication that some input variables are parameters through vx.
How about if that atomic function requires them to be parameters?
For instance, an atomic function could wrap an ADFun that requires the use of fun.new_dynamic(dynamic).

[bradbell]

I think that I have solved this issue; see the headings 01-05 and 01-06 on
http://coin-or.github.io/CppAD/doc/whats_new_19.htm

[joaoleal]

Thanks for the update! I will try to adopt atomic_three in cppadcodegen (I have already started). Probably it will not be completed in the next 2 weeks since I will be abroad. One question, will the reverse/forward jac/hess methods (not virtual) be called if I override the jac/hess methods? Best regards, João Na(o) domingo, 6/01/2019, 21:12, Brad Bell <[email protected]> escreveu:

…

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[bradbell]

I am not sure I understand the question
'will the reverse/forward jac/hess methods (not virtual) be called if I override the jac/hess methods?'

There is an base class definition, that returns false, for all of the virtual functions.
It the calculations require a virtual function that has not be defined, and NDEBUG is not defined, the program should return an error message identifying the required function.

Perhaps it is best to start with the example
http://coin-or.github.io/CppAD/doc/atomic_three_get_started.cpp.htm

As for using dynamic parameters. The following might be another place to get started:
http://coin-or.github.io/CppAD/doc/atomic_three_dynamic.cpp.htm

[bradbell]

There is a problem optimizing with atomic_three functions (which I am fixing); see
https://coin-or.github.io/CppAD/doc/whats_new_19.htm#01-11

[bradbell]

The problem has been fixed; see the heading 01-14 on
https://coin-or.github.io/CppAD/doc/whats_new_19.htm#01-14

[joaoleal]

Thank you!
I'm still implementing the changes to Cppadcodegen but the new atomic function API appears to be what is required to use parameters.