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Question: How to use 'sum' on functions?

Question:How to use 'sum' on functions?

unsown 113 Maple
input
September 02 2009
0

 

 

I have defined a function G, which has only one input parameter. I'm excuting following code.

sum(G(13-j), j = 0 .. 2)

with debug swiching on for 'sum' and 'G'. I got following error message:

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{--> enter G, args = `+`(13, `-`(j))

<-- ERROR in G (now at top level) = final value in for loop must be numeric or character}
Error, (in G) final value in for loop must be numeric or character
 

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It seems that function sum does not pass the value of j to the function G.
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