Can Matlab give me a disturbance randomly from a% to b% of a number?

Question

Ben Le 2017-2-18

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编辑： Ben Le 2017-2-18

Hello everyone,

Let say my number is 7, and I need to generate a randomly number from 5 to 400% of 7. Can Matlab give me the randomly numbers? Thank you in advance for your help!

Ben

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Answer 1

Matt J 2017-2-18

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编辑：Matt J 2017-2-18

在 MATLAB Online 中打开

ub=4*7;  %upper bound
lb=.05*7;  %lower bound
num=(ub-lb)*rand+lb

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John D'Errico 2017-2-18

Hmm. I interpret the lower limit differently from the question. You may be right though.

Ben Le 2017-2-18

Thank you very much, Matt!

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Answer 2

John D'Errico 2017-2-18

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https://ww2.mathworks.cn/matlabcentral/answers/325753-can-matlab-give-me-a-disturbance-randomly-from-a-to-b-of-a-number#answer_255371

在 MATLAB Online 中打开

Do you know how to generate uniform random numbers in an interval [x,y]? This is in the help for rand, so you should know, or be able to find out.

doc rand

Here, your limits are

[5,4*7]

since 4*7 is 400% of 7. Just read the help.

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Ben Le 2017-2-18

编辑：Ben Le 2017-2-18

John, Thanks for your suggestion. The doc rand doesn't help because it gives me a vector or a matrix. I need a single value to avoid conflicting with dimensions of other parameters in the function. Thanks again for the suggestion!

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