问题
I am absolutely new to Matlab and am trying to create an m-by-n matrix containing numbers within a specified range (ie. between -1 and 1).
Is there an equivalent function to rand(m, n) where I can specify the range myself or would I need to explicitely create a bunch of random numbers (as ie. was described in this answer) and create a matrix from them?
Any pointers to relevant Documentation, etc. highly appreciated.
回答1:
This is straight from Matlab's documentation for rand. Is this want you want?
Example 1
Generate values from the uniform distribution on the interval [a, b]:
r = a + (b-a).*rand(100,1);
Try reading the Matlab documentation by entering doc rand in the command window. It is really informative and user friendly.
回答2:
Perhaps an easier way of doing that would be to type in
r = randi ( [a b], m , n )
where a = -1 (or lower limit), b = 1 (or upper limit), m x n as specified. You might need to use randint if randi doesn't work.
回答3:
6 *rand(4) => creates a 4x4 matrix with random numbers between 0 and 6
6 *rand(4,5) => creates a 4x5 matrix with random numbers between 0 and 6
randi (5,3) => creates a 3x3 matrix with random integers between 0 and 5
2+(6-2)*rand(3) => creates a 3x3 matrix with random numbers between 2 and 6
来源：https://stackoverflow.com/questions/14482951/matlab-matrix-containing-random-numbers-within-specified-range