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[Help] Find number a to minimize sigma(square(a-x[i]))
By green_dragon, history, 10 years ago, In English

Given a sorted sequence of real numbers x[1],x[2],...,x[n]. Find a real number A to minimize:

This would be easy if the exponential number isn't presented: A=x[(n+1)/2]

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10 years ago, hide # |
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You can rewrite each term to , so the entire formula degenerates to . Note that this is a function in one variable (). Where does this function attain its maximum? How can you calculate this value?

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