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Vin{MBL}
5185 Posts
 ) to approximate pi using this method. This is what I have...i = 0 pi = 1 n = 3 DO WHILE i < 10000 pi = pi - (1 / n) n = n + 2 pi = pi + (1 / n) i = i + 1 LOOP pi = 4 * pi PRINT pi It outputs 2.66 etc; though, not pi like I was hoping for. Obviously there's something wrong with the program. Can you guys help me find it?  | ||
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Myrmidon
United States9452 Posts
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new_construct
Canada1041 Posts
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jjl
United States85 Posts
edit: beaten to it, gg new_construct | ||
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Vin{MBL}
5185 Posts
i missed that. gonna try it now :D EDIT: IT WORKS YAYYY!!!!!!!  | ||
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drop
Romania306 Posts
1-(1/3) n=3+2 1+(1/5) *** second recurration 1-(1/5) edit: ASDF~~! | ||
Insane
United States4991 Posts
Edit: Wow, open a page and get some food then come back and reply and the whole world has already posted -_- | ||
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Vin{MBL}
5185 Posts
are there any other rules/formulas I can do something like this with? How would I go about writing a program that lists all primes from 1 to x? (where x is a number the user inputs). is that above my level? | ||
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Insane
United States4991 Posts
On April 06 2008 11:56 Vin{MBL} wrote: I really really like doing these cool math things. Although I'm a programming noob and all. >_> are there any other rules/formulas I can do something like this with? How would I go about writing a program that lists all primes from 1 to x? (where x is a number the user inputs). is that above my level? No, it's not really above your level. The "simple" algorithm is the sieve of eratosthenes, which is frequently done in intro programming classes. If you want to do the primes, I recommend you implement that before trying the more advanced sieve of atkin<strike>s</strike>. Edit: it's atkin, not atkins, oops. also here are some links for it: http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes http://en.wikipedia.org/wiki/Sieve_of_Atkin Edit2: fyi 1 isn't considered a prime number  Edit3: I've never had to implement the sieve of atkin for any of my classes, by the way. If you do decide to do it and aren't familiar with the notation used in the pseudocode, reply here and I'll clarify it for you. | ||
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Vin{MBL}
5185 Posts
meaning not including 1 >_> | ||
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Insane
United States4991 Posts
On April 06 2008 12:03 Vin{MBL} wrote: I meant from 1 to x meaning not including 1 >_> Generally when I say "from a to b", I mean the lower limit is inclusive and the upper limit is exclusive  For example, i goes from 0 to 5 → i = 0, 1, 2, 3, 4 Maybe a geographical thing, dunno! | ||
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drop
Romania306 Posts
Vin - I advise you to use the Excel VBA btw (I know it's not the best, but you will probably use it at work one day - so start getting used to it) anyway, does any of you have any examples of more complicated VBA macros? I mean I can make the algorythms, but I dont know the syntax too well (e.g. it took me some time to figure out the: Worksheets("1").Cells(1, 1) = Pi in Excel) | ||
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Vin{MBL}
5185 Posts
On April 06 2008 12:05 HnR)Insane wrote: Generally when I say "from a to b", I mean the lower limit is inclusive and the upper limit is exclusive For example, i goes from 0 to 5 → i = 0, 1, 2, 3, 4 Maybe a geographical thing, dunno! hahah maybe i just suck at communicating math :D is there anyway to get a goto command in python? from google it seems like there isn't one. i'm trying to convert that pi program from basic to python. | ||
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Insane
United States4991 Posts
On April 06 2008 12:05 drop wrote: atkins diet :D Vin - I advise you to use the Excel VBA btw (I know it's not the best, but you will probably use it at work one day - so start getting used to it) anyway, does any of you have any examples of more complicated VBA macros? I mean I can make the algorythms, but I dont know the syntax too well (e.g. it took me some time to figure out the: Worksheets("1").Cells(1, 1) = Pi in Excel) This sounds like a terrible way to learn programming, and I've never had to know VBA anywhere -0- It depends upon what sort of job you are going into, I guess. | ||
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Insane
United States4991 Posts
On April 06 2008 12:07 Vin{MBL} wrote: hahah maybe i just suck at communicating math :D is there anyway to get a goto command in python? from google it seems like there isn't one. i'm trying to convert that pi program from basic to python. :/ "Go To Statement Considered Harmful" - Edsger Dijkstra 'Modern' programming doesn't use goto statements, and you should avoid them. You can achieve the same effects from the use of functions and loops. (ed: though you don't really need any functions for the pi program, I just meant that in general.) I don't really know Python, but I'll take a look at it -0- | ||
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Vin{MBL}
5185 Posts
Are you a compsci graduate Insane? I'm a high school junior that's having a bit of a problem deciding between compsci and engineering. (since I have little programming experience because CompSci classes in my country are basically non- existant | ||
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Insane
United States4991 Posts
On April 06 2008 12:11 Vin{MBL} wrote: is there anyway to get a while do in python? I can't find it here I don't know basic either, lol a for loop will work for what you want though. Googling around it looks like you want something like for i in range(0, 1000): Are you a compsci graduate Insane? I'm a junior that's having a bit of a problem deciding between compsci and engineering. (since I have little programming experience because CompSci classes in my country are basically non- existant No, I'm a comp sci undergraduate in my 3rd year. Edit: I just downloaded python, gonna install now. | ||
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tiffany
3664 Posts
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Insane
United States4991 Posts
<pre> pi = 1.0 n = 3.0 for i in range (1, 10000): pi = pi - (1.0/n) n += 2 pi = pi + (1.0/n) n += 2 print pi * 4 </pre> Probably violating all sorts of python coding conventions 3.14164265609 | ||
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Vin{MBL}
5185 Posts
Why did you use 1.0 and 3.0 instead of just 3 and 1 though? | ||
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Insane
United States4991 Posts
On April 06 2008 12:30 Vin{MBL} wrote: hahaha nice! Why did you use 1.0 and 3.0 instead of just 3 and 1 though? Because 1 / 3 = 0 (due to integer <strike>rounding</strike> truncation) I guess I could have just used 1 / n and had n be 3.0 or used 1.0 / n and just had n be an integer, but if you have both n = 3 and 1 / n, then the parens part will turn out to be 0 each iteration. Edit: changed rounding to truncation to be more accurate about what the comp does. | ||
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Vin{MBL}
5185 Posts
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Insane
United States4991 Posts
On April 06 2008 12:36 Vin{MBL} wrote: ahh so putting that .0 there is just telling it not to round off right? Hm yeah basically. In operations involving integers, the result will be an int (so if there is some remainder, it just gets cut off). If you make one of them not an int, then the result won't be an int. | ||
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drop
Romania306 Posts
On April 06 2008 12:08 HnR)Insane wrote: This sounds like a terrible way to learn programming, and I've never had to know VBA anywhere -0- It depends upon what sort of job you are going into, I guess. Well, I would expect to find MS Excel nearly everywhere (actually not that obvious, sometimes they cut the costs..), while in order to use any other language you need some sort of compilator. If you work on any important data, you probably cant access the internet, nor use a pendrive too - so you wont be able to download it. perhaps you are a programmer after I've seen an insurance company working on an acesss database I lost all faith anyway.. | ||
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Insane
United States4991 Posts
Yeah basically. | ||
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Vin{MBL}
5185 Posts
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Insane
United States4991 Posts
One of the lecturers who teaches intro to programming at my university wrote a book, I can't say anything about the quality of it not having read it, however. http://www.cs.washington.edu/education/courses/cse142/06sp/chapters/bookchapters.html [those are the pre-release chapters, if you want the latest version you have to shell out money, I think] edit: shit, just noticed the links are dead on that page, lol http://www.cs.washington.edu/education/courses/cse142/06wi/chapters/bookchapters.html this one works, though | ||
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Insane
United States4991 Posts
http://projecteuler.net/ [click on the problems link near the top of the page if you just scrolled down and got lost  ] | ||
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