By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Code Golf Stack Exchange is a question and answer site for programming puzzle enthusiasts and code golfers. It only takes a minute to sign up. Given two positive integers a and boutput the frequency distribution of rolling a b -sided die a times and summing the results. A frequency distribution lists the frequency of each possible sum if each possible sequence of dice rolls occurs once.

Try it online! Adding independent random variables corresponds to convolving their probability mass functions PMFor multiplying their characteristic functions CF. Thus the CF of the sum of a independent, identically distributed variables is given by that of a single variable raised to the power of a.

The PMF of a single b -sided die is uniform on 12However, two modifications are required:. Once the characteristic function of the sum has been obtained, an inverse FFT is used to compute the final result, and rounding is applied to correct for floating-point inaccuracies.

One can almost recognize the sinc function here Fourier transform of a rectangular pulse. Although the results in this case are exactly integers, in general there may be relative errors of the order of 1ewhich is why round Just generates all possible dice rolls, takes their totals, then counts. Each frequency comes labeled with its value.

Thanks to Lynn for the Cartesian product trick. Golfing suggestions are welcome!

## How to Calculate Probability using Multiple Dice

Just takes all possible dice combinations by taking the cartesian product of [1, b]a times, summing, and getting the length of each sum group. Test Suite. Try it online.

I've included this solution with the above one, since they're essentially equivalent.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. I'm a beginner at Python, and to start off my learning progress I created a simple program which will roll a dice and decides the probability of it. It would be great to have criticism on my code, like how I can improve it, make it shorter, etc. For styling, variable naming etc. Since you are not at all interested in the rolled list, why store a thousand values in memory?

You should always seed when using a RNG function. For more information on why this practice is favoured, check this SO response.

Instead of using random. We wanted a list of freq times rolling, so we may use a list comprehension for it. Instead of using a variable e. The code it's self seems to work alright. But you should really be commenting your code. By commenting i mean using to prefix a line or near the end of a line so that you can input text and for the interpreter to ignore it.

This let's you explain what each part of your code is doing at vastly improves your readability.

Other than that i'd say your fine but you should really be commenting your code. Edit: As pointed out by Chris H, you shouldn't comment every part of the code, and only parts that require explanation. For instance if you had a lengthy piece of code that can be hard to interpret without comments.

And yes you may not need to comment this particular piece of code but commenting on the less obvious parts are still good practice. Sign up to join this community. The best answers are voted up and rise to the top.

Rolling dice simulator with probability Ask Question. Asked 3 years, 2 months ago. Active 6 months ago. Viewed 10k times. Active Oldest Votes. With those in place, you have: import random import operator random. Python uses "good enough" defaults for the seed. It would be great if you could clarify that. The loop then increments each key based on the values generated by random. MarianD MarianD 1, 1 1 gold badge 5 5 silver badges 18 18 bronze badges. Explanation: We wanted a list of freq times rolling, so we may use a list comprehension for it.

Note: Double underline is preferred way in comparison with the single underline symbol. It is a styling method for emphasizing: "The syntax required a variable here but in this particular case I don't need it as I will never use it.

Wrenth Davis Wrenth Davis 11 3 3 bronze badges. Otherwise you end up with the kind of programmer who writes comments like def activateWidget : activates the widget. Xiao Huang Xiao Huang 11 1 1 bronze badge. Sign up or log in Sign up using Google. Sign up using Facebook.If you think coding a dice in Python is hard you are complete wrong! Welcome everybody! Today we will make a simple dice simulator from scratch.

If you are just starting to code, this tutorial is for you. If you need a simpler tutorial I suggest you to take a look at this tutorial: hello world! Now, we generate a random number and save it in a variable. We will call it selected. This library has a function called randint.

The randint min number, max number requires 2 parameters the lowest number and the highest number between we will pick our number randomly. In this case, our dice goes between If we want to show our selected number, we must use print. Your code should look like this:. If we press F5a message will ask us to save the code and then it will start running.

If everything went as expected, we should see something like this:. In my case, the random chosen number was 5. If we close the console and run the code again pressing F5the chosen number will be different.

To do that we will add some improvements:. If we run the code again, we should see a little message and the random number. Our code runs only once and then it close. What we need is to keep it running. To accomplish this, we will used while.

If you run this code, you will see that the dice will keep rolling as long as you press any key. We could keep improving the code even more, but lets leave it here until another day.

This example is great to start coding in python. Hope you liked it and see you soon! By Cosme Posted on: Jan 2, Here is where we will write our code. First we import the library that allows us to choose random numbers.To calculate the probabilities associated with results with rolling multiple dice, one must understand the basic concept of probability with outcomes rolling 1 die and independent events.

The possible outcomes when rolling one six sided die is 1,2,3,4,5,6. The sum of all the probabilities of all the outcomes must equal 1. When rolling 2 dice, there are 36 possible outcomes. Because what number shows up on the first die has no bearing on what shows up on the second die, the events are said to be independent. With independent events you simply multiply the probability of each even to get the probability of the combined event.

For instance, say you want to know the probability of rolling a 5,4. Without knowing there are 36 events, you can say.

Think of the possible outcomes with 5 as the first number showing up on the dice. Another question could be as follows, what is the probability of having the sum of the numbers on the two dice greater than or equal to 9?

To answer, need to check all the possible outcomes. If there are 3 dice involved, the same rules apply. There are just more possible outcomes, to be exact. Adding one more die multiplies the number of possible outcomes by 6. If the question is, what is the probability of rolling a 1,1,1 on 3 dice? There are many more examples and extensions of this concept, but I hope what I have shown you makes you understand the concept of calculating the probabilities when rolling multiple dice.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. In this code, the user is free to use strings like yEsyyesYES and Now remember, in version 1. I just started learning Python three days ago, but this is what I came up with for Python 3, and it works:. Learn more. Dice rolling simulator in Python Ask Question. Asked 3 years, 4 months ago. Active 1 year, 7 months ago. Viewed 69k times.

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I want to write a program that rolls a dice. Now this is what I have : import random print "You rolled",random. Thanks in advance! Dionisie Stratulat Dionisie Stratulat 21 1 1 gold badge 1 1 silver badge 2 2 bronze badges.

Possible duplicate of: stackoverflow. Hi, is your problem solved? Shabani May 17 '19 at Active Oldest Votes. Let's walk through the process: You already know what you need to generate random numbers. A while loop is calling to us. You need to check if the user inputs Y. And you can simply do it with "Y" in input. Amir A.

Shabani Amir A. Shabani 2, 3 3 gold badges 16 16 silver badges 35 35 bronze badges. Preeti Duhan Preeti Duhan 4 4 silver badges 7 7 bronze badges. This looks very similar to the existing answers, so you should elaborate what makes it better.

Also, code-only answers are generally frowned upon.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. This is a game for two users who roll 2 dice 5 times. If the total of dice is even, the player gains 10 points; if it is odd, they lose 5. If there is a tie after the five rounds, then the users have to roll one die to determine the winner.

This was for my NEA task in computer science, which I have now finished; if anyone has any suggestions on how I could have made it better they will be greatly appreciated. So, please suggest how I can improve it! You can use while True and break from the loop if you login successfully.

Alternately as you have a function you can return out of the function. Peilonrayz has a very good review, I just want to add a couple of things to the Login functionality.

The login works, but it is not very secure not that it matters much in this example but to give you a general idea of how to make this more secure for more real world applications.

This makes it realy easy for attackers to enumerate users as an attacker will know when a username exists or not. Best practise is to store hashed passwords only, so if the Database or in this case the source code leaks an attacker will know all the passwords stored there.

There is a good python module for getting passwords from user input namely getpass. Sign up to join this community. The best answers are voted up and rise to the top. Asked 1 year, 11 months ago. Active 1 year, 3 months ago. Viewed 58k times.

Toby Speight 40k 8 8 gold badges 58 58 silver badges bronze badges. Panda32 Panda32 51 1 1 gold badge 1 1 silver badge 5 5 bronze badges. Active Oldest Votes.

Rather than nesting if's you can use a guard clause: bad if username in 'User1', 'User2', 'User3', 'User4', 'User5' : code else: print 'Incorrect username, try again' good if username not in 'User1', 'User2', 'User3', 'User4', 'User5' : print 'Incorrect username, try again' continue code You can use str. You can use a turnery statement to reduce the amount of lines.Sign In. Welcome to the Roleplayer's Dice Roller, your one-stop virtual bag of dice!

Try out the Dice Rooms. For more information on what's currently going on and new stuff that's on the horizon for Rolz, see the current Patreon update: patreon.

Roll Any Dice Code. The Rolz. It interprets dice codes presented in the standard notation commonly used in roleplaying games, but it also knows advanced rules. Refer to the dice code documentation for more info. Please enter the dice code into the input field and hit enter. You can also click on the dice on the right to load them into the field.

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Click double if you want to roll one of them right away. Dice Codes Documentation Examples: click once to load, click twice to roll right away. If you want only the lowest result s counted, use "L".

The default die of this roll type is d6, so 4e4 can be used as a shorthand for 4d6e4. The default die of this roll type is d6, so 4r8 can be used as a shorthand for 4d6r8. The default die of this roll type is d6, so 4f4 can be used as a shorthand for 4d6f4. The default die of this roll type is d10, so 4m4 can be used as a shorthand for 4d10m4. The default die of this roll type is d10, so 4s4 can be used as a shorthand for 4d10s4. The default die of this roll type is d6, so 4x4 can be used as a shorthand for 4d6x4.

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