rand

rand(X, count)

X is a scalar/vector.

count is an INT scalar/pair. As a scalar, it indicates the length of the output vector; As a pair, it indicates the dimension of the output matrix.

Return a vector/matrix of random values.

• If X is a scalar, return a vector of random values that follows a uniform distribution on [0, X).

• If X is a vector, return a vector of random values drawn from the elements of X.

The data type of the result is the same as the data type of X.

// generate 20 random nonnegative integers less than 10
rand(10, 20);
// output: [9,9,8,1,1,0,8,3,2,6,4,6,9,6,8,9,3,2,1,5]

// generate 10 random non-negative double values less than 9.8
rand(9.8, 10);// output：[3.653754,1.750518,0.055747,5.219222,2.473778,6.337576,7.797493,1.392241,0.149499,5.697612]

// generate 3 random values drawn from vector x
x=3 5 4 6 9;
rand(x, 3);
// output: [9,3,6]

// generate a 2*2 random matrix less than 10
rand(10.0, 2:2) 

12:35:06 + rand(100, 10);
// output: [12:35:44,12:35:16,12:35:50,12:35:44,12:35:46,12:35:09,12:35:50,12:36:35,12:35:09,12:36:44]

x=`IBM`C`AAPL`BABA;
rand(x, 10);
// output: ["IBM","BABA","C","AAPL","IBM","C","BABA","AAPL","BABA","BABA"]

rand(x,2:3)