[CppAD] handling special functions in CppAD

[Michael Braun]

Hi.  I am started to look into using CppAD for some research projects, and I have a question about defining special functions.  As an example, I often use the log gamma (lgamma) function, and I know that its first derivative is a digamma function.  How can I tell CppAD this?  I see that there is a CPPAD_USER_ATOMIC macro, but this macro seems to want me to encode the specifics of the forward and reverse modes.  Since I am a mere end-user of AD, and not very familiar with the algorithmic details, I am hoping that there is an easier way to do this.

Thanks,

Michael Braun
braunm _at_ mit.edu






-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 1844 bytes
Desc: not available
URL: <http://list.coin-or.org/pipermail/cppad/attachments/20120102/29190add/attachment.p7s>