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[MUG] problems with subs()
| [MUG] problems with subs() |
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Author: Charles James Leonardo Quarra Cappiello
Posted: Thu, 21 Nov 2002 20:23:31 -0400
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>> From: "Charles James Leonardo Quarra Cappiello" "charsquarra"
Hi,
Im having problems with subs(), esentially, its behaviour inside a procedure
is different from direct execution:
lets suppose i have this list:
>L;
[ -1/f(z(w)) , (6*f(z(w))-3*D(f)(z(w))*z(w))/f(z(w))^3 , ...(other items) ]
in normal execution, i can eliminate z(w) with subs in the following way:
>subs( z(w)=u , L[2] );
(6*f(u)-3*D(f)(u)*u)/f(u)^3
then i want to make this a function:
>unapply( % , f , u);
(f,u)->(6*f(u)-3*D(f)(u)*u)/f(u)^3
but inside a proc im doing: (P is a function, ord is an integer)
...
func:=0;
for k from 1 to ord do;
temp:=subs( z(w)=u , L[k] );
temp:=unapply(temp ,f ,u);
func:=unapply( apply(func,t)+apply(temp,P,0)*t^k/k! , t);
end do;
...
the weird thing is that when im executing this procedure, the resulting
function 'func' keeps z(w) terms, why subs isnt working properly inside the
procedure?
Greetings,
Charles Quarra
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