Select a random number from a set

I'm simulating a single blackjack hand and am trying to "draw" a card. I can't use the randi function because I don't want all possibilities to have the same probability of being selected. So what I have done is created a row vector , (x), of all the possible card values. Now I would like draw a random number from this selection for my 'draw' function. Thanks for the help!

x = [1,2,3,4,5,6,7,9,10,10,10,10,11] theCard = randi?

[Nour Ahmed]

If i have a matrix 3x3 and i fill up them from 1 to 9 and want to choose randomley a number by computer how i can make this happen?

[Walter Roberson]

reshape(randperm(9), 3, 3)

ans = 3×3

4 6 7 5 1 2 3 8 9

[Nour Ahmed]

I mean i need the computer to pic a number randomly not reshaping the matrix

[Walter Roberson]

T1 = randperm(9)

T1 = 1×9

9 5 7 2 1 6 8 4 3

reshape(T1, 3, 3)

ans = 3×3

9 2 8 5 1 4 7 6 3

T2 = randperm(9)

T2 = 1×9

1 6 7 3 8 9 2 5 4

reshape(T2, 3, 3)

ans = 3×3

1 3 2 6 8 5 7 9 4

You can see that the randperm(9) call is picking values randomly, and the reshape is making a 3 x 3 out of it.

Or perhaps you mean that you have created an existing 3 x 3 matrix and you want to take a random value out of it?

T3 = [11 12 13
      21 22 23
      31 32 33]

T3 = 3×3

11 12 13 21 22 23 31 32 33

●

T3(randi(numel(T3)))

ans = 22

T3(randi(numel(T3)))

ans = 21

[Nour Ahmed]

Yesss thankk youuu

Answer 1

[Lucas García]

There are a few ways to do it. For example, using randi to select in which position is the card that you will extract.

pos = randi(length(x));
card = x(pos);

[Matt Medley]

I'm brand new to matlab. I'm not sure what you mean by that. Thank You

[Lucas García]

By doing this: pos = randi(length(x));

you will be randomly choosing one of the positions in x.

Then by doing: card = x(pos);

you are retrieving the card placed in that position.

I'm not sure if this is exactly what you are looking for.

[usman younus]

 A=[3818.36,7632.40,11446.44,15260.48,19074.52];   
B=[657.15,1089.15,1521.15,1953.15,2385.15];

i have 2 arrays, I want to select randomly any 5 numbers from both arrays how can i select?

[N/A]

here is a way to do it :

for i = 1:5

arrayA(i) = randi(length(A));

arrayB(i) = randi(length(B));

end

[Vineeth Krishnan]

for i=1:5

arrayA(i) = A(randi(length(A));

arrayB(i)= B(randi(length(B));

end

Answer 2

[Souarv De]

rand_Pos = randperm(length(x),1)
card = x(rand_Pos)