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Question: How to do that a conditional es evaluated "globally" with `IF`?

Question:How to do that a conditional es evaluated "globally" with `IF`?

jean-jacques 39 Maple
student
November 29 2010
0

Dear friends,

 

I can compute,  with Maple 14, summe1:

> summe1= sum( sum( (`if`(1 < x , 1, 0))*   x*j, x=0..2), j=0..2);

 

However, when I modify  summe1 to summe2, I get an error message:

 

> summe2= sum( sum( (`if`(1 < x+j , 1, 0))*  (x*j), x=0..2), j=0..2);

 

> Error, (in eval/if) cannot determine if this expression is true or false: 1 < j

 

Is there some way to avoid this error? ( I do mean, that the conditiona IF identify the values that J will take).

 

Kind regards,

 

Jean-Jacques
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