On Aug 29, 3:07 am, Burcin Erocal <[EMAIL PROTECTED]> wrote:
> On Thu, 28 Aug 2008 15:28:03 -0400
>
>
>
> Tim Lahey <[EMAIL PROTECTED]> wrote:
> > Hi,
>
> > Maple has a really useful feature of inert integrals
> > and derivatives. Basically, the integrals and derivatives
> > show up in the equations, but aren't evaluated until
> > a command to evaluate them is explicitly given. So,
> > you can delay the evaluation until after you've processed
> > the expression to the point where it can be evaluated.
>
> > This feature comes in very handy during complicated
> > derivations because you can see which terms are integrals
> > or derivatives and manipulate them along side
> > non-integrals/derivatives.
>
> > Is there a way to do this in Sage?
>
> This is not supported in Sage at the moment, but it is definitely
> planned. It should be fairly simple to implement this using the new
> symbolic function interface from ginac, which allows one to specify
> custom simplify/automatic evaluation functions.
>
> I am not familiar with the maple syntax. Can you give some examples of
> how to use these features so I can play with them without having to dig
> through documentation?
The Mathematica syntax is Hold[Integral[x,{x,0,1}]]. This remains
unevaluated until it is wrapped with an Evaluate[]. The nice thing
about this syntax is that it works for any kind of expression (not
just integrals).
JM
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