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Summations involving 0^n

Posted on 2007-12-03 13:56 By Colin Gillespie (Maple Rating 1 13)
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Dear All,

I seem to be having trouble with 0^n in maple, can someone help?

Essentially, I have a complex function that simplifies under certain conditions to

f:=1.*0.^n/factorial(n);

but

sum(f,n=0...0);

gives 0. Whereas,

evalf(subs(n=0,f));

gives 1.

Any ideas?

Thanks

Colin

‹ Plot a sequence piod controller ›
gkokovidis's picture

Summations involving 0^n

Comment on 2007-12-03 14:25 from gkokovidis (Maple Rating 4 686)

Maybe you are looking to use "add" instead of "sum".

>add(f,n=0...0);
1.0

>?sum/details

for more help on this.

Regards,
Georgios Kokovidis
Dräger Medical

Robert Israel's picture

0^n

Comment on 2007-12-03 14:42 from Robert Israel (Maple Rating 4 1460)

The basic problem, I think, is that 0^n in Maple gives 0 if n is non-constant (although 0.^n does not, I think somewhere in sum it gets "simplified"). There have been complaints about this forever, but it's been around for so long and is so deeply embedded in Maple that I doubt it's going to get changed any time soon.

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