I want to generate a random number between 1 and 10, but I want the chance of a 10 to be greater

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Thomas Verhaegen
Thomas Verhaegen 2016-12-1
回答： Roger Stafford 2016-12-1
I want to simulate some parts of BlackJack. For wich I need the dealer to draw a random card. Since a jack, a queen and a King are a 10. I have a 4/13 chance of getting a 10. How can I program the 10 to be (4/13) greater and still have it be random ?

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回答（3 个）

the cyclist
the cyclist 2016-12-1
编辑：the cyclist 2016-12-1
If you have the Statistics and Machine Learning Toolbox, you can do it like this:
numberSamples = 100;
y = randsample(1:10,numberSamples,true,[1 1 1 1 1 1 1 1 1 4]/13);
Another simple way (that is very intuitive) would be to generate uniform random integers from 1 to 13, and then apply a max of 10.
You can do this as so ...
y = min(10,randi(13,[1 numberSamples]));
Star Strider
Star Strider 2016-12-1
Another approach:
Deck = repmat([1:10 10 10 10], 130, 1); % Create Deck
Deck = Deck(:); % Create Vector
Tally1 = accumarray(Deck(:), 1); % Proof (Delete)
Tens_Pct1 = Tally1(10)/sum(Tally1); % Proof (Delete)
idx = randperm(numel(Deck), 4); % Deal Cards Index (4 Cards)
Deal = Deck(idx); % Deal Cards
Tally2 = accumarray(Deal, 1); % Proof (Delete)
Tens_Pct2 = Tally2(10)/sum(Tally2); % Proof (Delete)
The ‘Proof’ lines simply demonstrate that the code does what it’s designed to do.
Roger Stafford
Roger Stafford 2016-12-1
For n draws, do this:
r = rand(n,1);
card = ceil(18*r-10*(r-1/2).*(r>=1/2));
There will be a fifty percent chance of drawing ten (10) through king (13).

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