Algorithm to calculate the sum of a mathematical series [closed] - algorithm

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Recently I came across a online tool, which given a summation calculates its formula. I have tried for many such summations and has given me correct answer.
I was curious as to which algorithm does it use to solve it.
EDIT: It turns out the tool uses wolframaplha api's. But even if you search on wolfram alpha you will get the same result.

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J48 algorithm in weka algorithm or flowchart steps [closed]

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I am new in the machine learning area. please, I was wondering if you could provide me with algorithm or flowchart steps for J48.
note: I am using the default setting in weka.
thank you for your help.
J48 is based on Quinlan's C4.5.

What functions/algorithms produce O(n^2) time complexity? [closed]

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I'm learning about this in class and I'm really struggling to come up with any examples besides nested for loop. Can anyone share other known algorithms that have n^2 time complexity?

Designation of algorithms performing automatic learning [closed]

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Can any algorithm that performs automatic learning be called a "machine learning algorithm"? Or is this designation is reserved to the known ML algorithms like SVM, Feature Selection... ?
Any algorithm that learns to do a task by itself and gets better at it is considered machine learning even if it just as simple as computing the joint probability. Only condition is automated learning, that's all.

What is this algorithm? [closed]

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I found this game and I'm very curious for know about of algorithm implemented in it.
I don't know how look for this, I don't know what is this algorithm and I want study it.
This is the game http://www.rustylake.com/puzzle-and-skill-games/coloruid.html
Really Thank you.
This seems like a basic "Flood Fill" algorithm.
It's performed on custom 'pixels', but the principle seems the same.

Determine that the languages accepted by two NFA's are same or not [closed]

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I have two NFA's.
I need to determine whether both recognize the same language
I would be much obliged if anyone could be so kind enough to explain how to do this.
You can get a canonical representation of an NFA by computing its equivalent minimal DFA.
If two NFA's have the same canonical representation, they accept the same language.

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