Integrate with explicit integration variable/infetesimal...

Making this easier so I know the result:
	f(i) := (i*di - c*di);	

xintegrate( f(i), i, di )
	Step1 => integrate (i - c) di
	Result => i^2/2 - c*i

Basically I have equations where the integtration variable (di) is 
scattered throughout the equation (trying to use factor to get it out 
isn't working).

In the case I gave, now I realize I don't know if can be integrated, in 
which case xintegrate could tell me it is improper.  Also in such 
situations as:
	f(i) := (i*di - c)*di

I don't know if this can be integrated so, I've looked for a few days 
now and can't find the math to determine that...


Stavros Macrakis wrote:
> What would you like xintegrate to return in this case?
> 
> What is your actual problem?
> 
> I suggest you write these things to the list -- it is often easier to
> find a solution when you have the big picture.
> 
>            -s
> 
> 
> On Wed, 22 Sep 2004 16:49:22 +0200, edA-qa mort-ora-y
> <eda-qa@disemia.com> wrote:
> 
>>Is it possible to get Maxima to automatically integrate expressions of
>>this form:
>>
>>        f(i) := (i*di - c);
>>
>>That is, a function like integrate that takes three parameters:
>>
>>        xintegrate( f(i), i, di );
>>
>>Obviously the above case is trivial, but in my equation I can't easily
>>separate out the di term in order to pass the function to integrate (I
>>have an expression in the form of a sum right now, but I want to create
>>the integral instead).
>>
>>--
>>edA-qa mort-ora-y
>>Idea Architect
>>http://disemia.com/
>>
>>_______________________________________________
>>Maxima mailing list
>>Maxima@www.math.utexas.edu
>>http://www.math.utexas.edu/mailman/listinfo/maxima
>>
> 
> 
> 


-- 
edA-qa mort-ora-y
Idea Architect
http://disemia.com/