Problem 174. Roll the Dice!

Created by @bmtran (Bryant Tran)

Solve Later

Description

Return two random integers between 1 and 6, inclusive, to simulate rolling 2 dice.

Example

   [x1,x2] = rollDice();
   x1 = 5;
   x2 = 2;

Solve

Solution Stats

7245 Solutions
2494 Solvers

Last Solution submitted on Apr 06, 2020

Last 200 Solutions

Problem Comments

13 Comments

13 Comments

Show 10 older comments

Sourav Mondal on 20 Nov 2012

is the solution correct???

Jonathan on 19 Nov 2014

To clarify the problem statement, it would be good to specify the dice are fair.

Dale Crawford on 7 Dec 2015

I've done something like this on an arduino for one of my classes

John D'Errico on 23 Aug 2016

The first test case for this problem is flat out statistically terrible! In fact, it is quite easy for that assertion to fail on a well defined set of uniform dice! So if you submitted a "valid" solution to this trivial problem, and it failed, then re-submit it. It may well succeed the second time you try, with no change to your function at all.

Alexander Kramlich on 14 Sep 2016

Use randi function instead of rand.

David Verrelli on 17 Oct 2017

Rigorous testing of RNG's is a challenging topic. See e.g. https://en.wikipedia.org/wiki/Diehard_tests and https://en.wikipedia.org/wiki/TestU01 .

jiangming wang on 10 Apr 2019

why can't use unidrnd(6)?

Oliver Warlow on 12 Apr 2019

Anyone want to tell me the odds of correctly completing the problem, and then having the checker reject it? Because i have a screenshot of my solution being rejected. Tried exactly the same again and it passed.

goc3 on 22 Apr 2019

@jiangming wang: Cody utilizes vanilla MATLAB (no toolboxes).

Sariha Azad on 7 Jun 2019

Someone please explain me the question

Le Manh Long Le Manh Long on 29 Sep 2019

Đề khó hiểu thật !

David Motson on 4 Nov 2019

I offered a solution that should be working (works okay in Matlab) but not here: round(rand()*5+1); - not the most optimum, but still provides the correct output, yet fails the test

Fakhteh Ghalami on 9 Nov 2019

can anyone help me why
x1 = 1 + (5)*rand(1,1);
x2 = 1 + (5)*rand(1,1);
is wrong???

Solution Comments

Solution 1985875

1 Comment

1 Comment

Robin French on 22 Oct 2019

This failed on first submission, and completed successfully on second. Does this mean the test is non-robust?

Solution 1875872

1 Comment

1 Comment

lmehl on 16 Jul 2019

LOL. Just my luck.

Solution 311131

2 Comments

2 Comments

niko_k on 27 Aug 2013

solution is correct in my opinion.

Tim on 27 Aug 2013

rand(1,1)*5+1 will produce random numbers uniformly distributed between 1 and 6; round will convert values from 1 to 1.5 to 1, and values from 1.5 to 2.5 to 2, so 1 will occur only about half as often as 2. Overall, 1 and 6 will occur only about half as often as 2, 3, 4, and 5.

Solution 167407

1 Comment

1 Comment

Paul Peeling on 23 Nov 2012

my second ever pseudo random number generator (the first wasn't very random) http://en.wikipedia.org/wiki/Linear_congruential_generator

Solution 122564

2 Comments

2 Comments

Peter Wittenberg on 11 Aug 2012

This is not two random rolls. The second number will never match the first, so the statistical distribution is not correct, although the test suite is not sophisticated enough to catch it.

Matthew M. on 28 Aug 2012

^Agreed.

Solution 68395

1 Comment

1 Comment

Kye Taylor on 31 Mar 2012

Super rad test suite

Solution 46500

2 Comments

2 Comments

Giuseppe Cardillo on 20 Feb 2012

THIS SOLUTION IS CORRECT!!!!!

David Verrelli on 17 Oct 2017

Not correct. Same coding issue as in Solution 311131.

Solution 29002

2 Comments

2 Comments

Santiago Velasco-Forero on 2 Aug 2012

False solution.

David Verrelli on 17 Oct 2017

Agreed: this is not a genuine solution, although it does (sometimes) pass the current test as implemented.

Solution 15159

1 Comment

1 Comment

@bmtran (Bryant Tran) on 30 Jan 2012

Nice! didn't know about that function.

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Problem 174. Roll the Dice!

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Problem 174. Roll the Dice!

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Last 200 Solutions

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Problem Recent Solvers2494

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