How can I generate a random number that is negative or positive and between two other values?

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Lena Berard 2015-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/256671-how-can-i-generate-a-random-number-that-is-negative-or-positive-and-between-two-other-values

评论： Jacob 2023-10-11

I need to write a function that generates two numbers that are between the negative and positive values of an integer. For example, if I call the function and input 7 it should generate two random numbers between -7 and +7. I can't figure out a way to use the randi function because the values I need can't be just integers.

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Answer 1

Walter Roberson 2015-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/256671-how-can-i-generate-a-random-number-that-is-negative-or-positive-and-between-two-other-values#answer_200664

Hint: rand()-1/2 is in the range -1/2 to +1/2

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Jacob 2023-10-11

在 MATLAB Online 中打开

if you a number x

generating random between -x and x

x = 7;
for i = 1:x*2
    z(i) = (2*x)*(rand(1)-.5);
end
disp(z)
    2.5026    1.8492    0.0427   -1.6578    5.2690    5.5979   -2.9920   -6.5039    6.2270   -1.6916   -3.8918    5.8560    1.9215   -6.7670