Stats project for a random variable
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Hello. I want to create script that does the following:
1) Simulate 20 repetitions of obtaining a value for X , that is, roll until a 1 is rolled, record the result and repeat this 20 times.. For example, if we roll 6,2,4,4,1 then X = 5 (we count the final roll). Display the 20 'X' values.
2) Calculate and display the mean, variance and standard deviation for the 20 'X' values.
2 个评论
James Tursa
2020-12-10
What have you done so far? What specific problems are you having with your code?
回答（2 个）
Walter Roberson
2020-12-11
编辑：Walter Roberson
2020-12-12
1 个投票
Rolling turns out to be difficult to model, and normally objects would slip instead of rolling. However fortunately someone has written an S function in C to model rolling: see https://www.mathworks.com/matlabcentral/fileexchange/49374-rolling-ball-on-plane
3 个评论
Walter Roberson
2020-12-11
编辑：Walter Roberson
2020-12-12
If you choose to use a CAD program to design the 3d "1" to roll then you might want to use Simscape Multibody Link to import the design file. See https://www.mathworks.com/help/physmod/smlink/ug/installing-and-linking-simmechanics-link-software.html
John D'Errico
2020-12-11
A splendid answer. Probably written while drinking some Rolling Rock - a beer that I doubt is even sold anymore.
Walter Roberson
2020-12-12
Rolling Rock is still sold, but the sites I find say it has declined considerably in quality.
Image Analyst
2020-12-12
编辑：Image Analyst
2020-12-12
Is this a homework problem on Monte Carlo simulation?
I've uploaded plenty of Monte Carlo Demos, attaching some of them again here.
Just search for Monte Carlo or click some of the links on the right.
In the meantime, try getting all 20 rolls. This is a very easy problem, even for beginners. Here's a start:
% Create list of 20 experiments where we roll the die up to 500 times. 500 is enough that we should definitely see a 1 by 500 rolls.
rolls = randi(6, 20, 500);
lookForValue = 1; % Whatever number you want.
for r = 1 : size(rolls, 1)
thisRoll = ... % Get row from rolls matrix.
firstOccurrence(r) = find(........
end
plot(...............
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2020-12-10
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