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Once Again The Sum() Function

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#1 fiberoptik


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Posted 24 February 2005 - 12:20 AM

Some time ago i posted a question about the CP couldn?t solve the sum(1/x^2) with more than 250 steps, and take a long time to solve it with 250 steps or less. But if i write sum(x, 1, 100000) or even more, the CP calculates it and very fast.
Can somebody explain this ?



#2 Lovecasio


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Posted 24 February 2005 - 05:52 AM

Hi. :)
If your function is sum(x,1,n), in fact the ClassPad just calculate n(n+1)/2. I think it first check the type of your input function, and if it "realize" the pre-programed type, it will solve it very fast ( just calculate some simple things). If the function is strange, it will add the sum step by step, and you know, all internal calculations are "Algebra type", I mean it will return exact value. So, it would take considerable time.
Oh? How about the result on OS 2.0? :)

#3 Guest_Guest_*

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Posted 24 February 2005 - 02:59 PM

The result in OS 2.00 was exactly the same as in OS 1.24
We must wait for another OS release...



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