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tinab
 2 years ago
I'm trying to complete the third problem on Problem set one however I don't understand bisection search. Does it always need to have a epsilon? Also I finally looked at the solution after a few hours of trying and it does not work either, is it impossible?
tinab
 2 years ago
I'm trying to complete the third problem on Problem set one however I don't understand bisection search. Does it always need to have a epsilon? Also I finally looked at the solution after a few hours of trying and it does not work either, is it impossible?

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bwCA
 2 years ago
Best ResponseYou've already chosen the best response.12011 class?? typically the problemsets have you use 'epsilon' when working with floating point numbers  when comparing numbers that are the result of floating point calcs there are inherent errors that need to be accounted for  those calcs might not produce a value that you expect and so may not compare the way you want them to. you need to set a tolerance. bisection is an algorithim that reduces the problem (or search space) by 1/2 on each iteration. did you watch the lecture and read the readings and try out the examples from the lectures? what exactly don't you 'get'?

tinab
 2 years ago
Best ResponseYou've already chosen the best response.0Thanks, I did read the readings and watch the lectures. I apparently was not understanding the need for an epsilon, the moment I added one in the code works fine. I guess I hit a silly level of frustration and didn't think about inherent errors.

bwCA
 2 years ago
Best ResponseYou've already chosen the best response.1using the Decimal clss from the decimal module you can see the actual values http://dpaste.com/810175/ http://docs.python.org/library/decimal.html#decimalobjects
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