anonymous
  • anonymous
Hi, The solution to #2 for Problem set # 1 seems incomplete. I could be wrong, but it doesn't test for if the monthly payment needs to be reduced. Also I'm getting vastly different numbers from the answer key using the test case. I tested it in Excel and my program matches that though. Can anyone look at my code? Thanks a lot.
MIT 6.00 Intro Computer Science (OCW)
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
It's the uncommented portion of the attached file. I know I should clean my code up a bit, seems a bit redundant...but the logic is: I'm checking for the initial guess being larger vs smaller (bisection guessing). If it is too small, I go to the first chunk of code. If it is too large I go to the second. Note, I did make sure to add interest PRIOR to any deductions as the professor specified. Excel checks out as well. I will attach.
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anonymous
  • anonymous
Attached Excel with the 1200 Balance, .18 example
1 Attachment
anonymous
  • anonymous
I also noticed he didn't make it pay in increments of 10 in his attached answer sheet, or check for a payment that is too large.

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anonymous
  • anonymous
Attached problem set for ease of use.
anonymous
  • anonymous
I'm not on that problem yet. I am having problems with a syntax error in the second one. Let me get there and then I will be able to give you a more informed guess.
anonymous
  • anonymous
Were you able to get the first portion of code to work properly before diving into the bisection search? I am getting ready to transform my working code into the faster bisection method today.
anonymous
  • anonymous
In fact, you dont use bisection search in your answer. You use upper and lower bound to make an educated guess at the beginning "MinPay = round((High + Low)/2.0, -1)" but after that you keep adding or substracting 10$ if the initial guess is too high/too low. Using bisection search means you make a guess using predetermined bounds, and you modify these upper/lower bound once you calculated the balance with the guess. If the guess is too high ( = balance is negative), you set the upper bound to be the current actual guess. Vice versa if the current guess is too low ( = balance is still positive) it becomes the lower bound. Then, the next time your loop is executed, the guess should be based on these new upper/lower bounds. It will allow you to progressively pinpoint a reliable guess. Now you just have to deal with guess precision : when do you think the guess is precise enough to be kept.
anonymous
  • anonymous
strategically placed print statements are a great way to 'debug' your code. http://dpaste.com/1324113/ the while loops that run thru 12 months of payments - you probably shouldn't round at each iteration. you could greatly simplify your code: if you just start with a minpay of $10 then you won't have to worry about decreasing it - this change would get rid of almost half your code and possibly make it easier to read and debug. your solution is definitely not working

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