Description
Return two random integers between 1 and 6, inclusive, to simulate rolling 2 dice.
Example
[x1,x2] = rollDice(); x1 = 5; x2 = 2;
Solution Stats
Problem Comments
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13 Comments
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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
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1 Comment
Piero Cimule
on 20 Jun 2020 at 0:12
r = randi(6,[1,2])
x1 = r(1);
x2 = r(2);
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2 Comments
Robin French
on 22 Oct 2019
This failed on first submission, and completed successfully on second. Does this mean the test is non-robust?
Syd Shahed
on 26 Apr 2020
the test case is totally erroneous.
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1 Comment
lmehl
on 16 Jul 2019
LOL. Just my luck.
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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.
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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
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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.
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1 Comment
Kye Taylor
on 31 Mar 2012
Super rad test suite
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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.
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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.
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1 Comment
@bmtran (Bryant Tran)
on 30 Jan 2012
Nice! didn't know about that function.
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