It's quite a nice idea, but I'm not too sure why anyone would want to

use it. There are already a number of optimised and fully featured

mathematical libraries out there. Without somesort a capability for

algebraic manipulation, for example, the ability to determine the value

of a variable within an equation given a number of relations (which

coincidently would be really useful, but non-trivial to implement), the

library basically amounts to some santatic sugar.

What I find interesting, however, is the named associations for function

arguments ( x -> 5 ), for example, but I think there is already a

library in Boost that enables such functionality.

S.

-----Original Message-----

From:

[hidden email]
[mailto:

[hidden email]] On Behalf Of Stephen Gross

Sent: 04 April 2006 18:29

To: Boost

Subject: [Boost-users] Idea for equation library

I've got an idea for a toolkit that uses boost::lambda to let you write

'equations' on the fly in c++. For instance, consider the following

pseudo-code:

==================

Equation e = x + y;

print e(x -> 5, y -> 10) // Prints 15

e = x - y

print e(x -> 5, y -> 10) // Prints -5

Equation d = eq(e) + z

print d(x -> 1, y -> 2, z -> 3) // Prints 2 ==================

The idea is that you can encapsulate an algebraic function in a

standalone 'Equation' instance, and dynamically reassign that equation.

It's built off of boost::lambda (of course), but it lets you name the

variables rather than just refer to them with the standard placeholders

(_1, _2, etc.). Is it worthwhile for me to post the toolkit code on this

group?

Thanks,

--Steve

Stephen Gross

Case Western School of Medicine

Cleveland, OH

"By Grabthar's hammer, by the sons of Worvan, you shall be avenged." -

Dr.

Lazarus

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