Re: Help with Differentiation

John Fletcher <J.P.Fletcher <at> aston.ac.uk> writes:

> I am attempting to use this as hinted in the manual.
> 
> Ideally I would like to be able to have a vector of functions and a 
> vector of differentials and generate the matrix of all the 
> differentials.  One problem is that it seems that the return type of 
> 
> Simplify(Diff(f,x))
> 
> will be different for each expression.
> 
> Have I missed something?

No. You stumbled over the problem how to cross the compile-time/runtime boundary.
Daixtrose proviodes glue code to add polymorphic behaviour via
ChangeDisambiguation (see the docs).

> Then I will want to get numerical values for particular cases, so I 
> will need to add a value to the symbol.  I have done that, but don't 
> have any example how then to evaluate the expressions.

You do not need to add any members to the symbol.  
In order to show you how to achieve vector-valued access to values
I added new examples in src/demos/Solver.

I also fixed daixtrose to work with gcc-3.4.4 and boost-1.33.0.
So please check out the cvs in order to get rid of a lot of troubles.

Do not hesitate to ask further questions. 

best regards,

Markus




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