[Tutor] generating independent random numbers

[Carter Danforth]

Wow... I'm really slipping here with the leaps years, good catch on the
2000s. And yeah, a list does make a whole lot more sense. Thanks Dave.

I've checked multiple sources on Zeller's formula, initially came across it
on this book on vedic math (highly recommend it): http://amzn.to/bNXBM6. But
here's the Wikipedia on it:
http://en.wikipedia.org/wiki/Zeller%27s_congruence

It's not *2 in the Julian calendar, but it is in Gregorian, which is what
we're also using for the leap yrs - http://en.wikipedia.org/wiki/Leap_year


On Tue, Sep 28, 2010 at 9:34 PM, Dave Angel <davea at ieee.org> wrote:

>  On 9/28/2010 5:11 PM, Carter Danforth wrote:
>
>> Thanks for the replies, Dave and Joel. The reason I'm not just using the
>> time or datetime modules for a random date is because it's restricted to
>> 1970-2038; I'm pulling dates from 1600-3099. Thanks a lot for the pointer
>> about the leap years, Dave, as well the class instances; just updated it
>> and
>> it's all working now, and also included the rest of the code too w/ answer
>> verification and time tracking.
>>
>> I want to start using this program to test myself for speed calculation
>> using Zeller's formula, it's pretty cool for determining the days of dates
>> -
>> http://mathforum.org/dr/math/faq/faq.calendar.html
>>
>> Because of the way variables C and D are split up from the year in the
>> formula, I split up the year for self.c and self.y.
>>
>> ------------------------
>>
>> import random, time, datetime, calendar
>>
>> class Date:
>>     def __init__(self):
>>         self.c = random.randint(16,30)
>>         self.y = random.randint(0,99)
>>         self.month = random.randint(1,12)
>>         self.year = self.c*100 + self.y
>>
>>         apr = [4,6,9,11]
>>         feb = [2]
>>         notleap = [1700, 1800, 1900, 3000]
>>
>>         if self.month in feb:
>>             if self.year%4 == 0:
>>                 if self.year in notleap:
>>                     self.k = random.randint(1,28)
>>                 else:
>>                     self.k = random.randint(1,29)
>>             else:
>>                 self.k = random.randint(1,28)
>>         elif self.month in apr:
>>             self.k = random.randint(1,30)
>>         else:
>>             self.k = random.randint(1,31)
>>
>>         if self.month in [1,2]:
>>             d = self.y - 1
>>             m = self.month + 10
>>         else:
>>             d = self.y
>>             m = self.month - 2
>>
>>         z = self.k + (13*m-1)/5 + d + d/4 + self.c/4 - 2*self.c
>>
>>         if z<  0:
>>             r = (abs(z)/7)*7 + z + 7
>>         else:
>>             r = z%7
>>
>>         dict = { 0: 'Sunday', 1: 'Monday', 2: 'Tuesday', 3: 'Wednesday',
>> 4:
>> 'Thursday', 5: 'Friday', 6: 'Saturday' }
>>         self.day = dict[r]
>>
>> t1m = time.localtime().tm_min
>> t1s = time.localtime().tm_sec
>> t1 = t1m + t1s/100.0
>> n = 0
>> x = 0
>>
>> while n<  10:
>>     newdate = Date()
>>
>>     print '\n',calendar.month_name[newdate.month], newdate.k,',',
>> newdate.year,'=',
>>     answer = raw_input()
>>     if answer.capitalize() == newdate.day:
>>         pass
>>     else:
>>         x += 1
>>     n += 1
>>
>> t2m = time.localtime().tm_min
>> t2s = time.localtime().tm_sec
>> t2 = t2m + t2s/100.0
>> td = t2 - t1
>>
>> print '\n',x,'out of 10 wrong\nAvg time/question:',td/10,'\nTotal
>> time:',td
>>
>>
>> <snip>
>>
>>  (You top-posted your response, so your message is out of order)
>
> I haven't tried to run your code, but there is at least one problem.
>
> Your notleap list is very incomplete.
>
> notleap = [1700, 1800, 1900, 2100, 2200, 2300, 2500, 2600, 2700, 2900,
> 3000]
>
> I'm a little suspicious of your version of Zeller.  I wouldn't think that
> last term should have a 2* in it.
>
> I'm not sure why you use a dictionary to calculate self.day.  A list would
> work just as well.
>
> DaveA
>
>
>
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