Generating random number between 1 to 10

Question

Aftab Ahmed Khan 2014-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/139713-generating-random-number-between-1-to-10

评论： Souarv De 2021-10-8

Hi everyone,

I want to generate a random number between 1 to 10 for 10 loop iteration, with this code section of mine but i want that each time it generate a different number. Forexample if 2 is generated for the 1st loop iteration, then for the rest of 9 iteration. It won't generate 2 again. Similarly for the rest of other numbers between 1 to 10.

for i=1:10
r = (b-a)*rand(1) + a
end

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Answer 1

dpb 2014-7-1

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编辑：dpb 2014-7-1

在 MATLAB Online 中打开

That's "sampling w/o replacement". One relatively simple way--

N1=1; N2=10;   % range desired
p=randperm(N1:N2);
for i=N1:N2
  r=p(i);
  ...

ERRATA

As noted, in comment, forgot there isn't such a form for randperm. Seems like reasonable enhancement altho it's easy enough to scale externally, too.

Use

N=10;   % range desired
p=randperm(N);
for i=1:N

instead.

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Aftab Ahmed Khan 2014-7-1

Ok thanks, i solved it.

dpb 2014-7-1

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Ewww...mea culpa. I was thinking there was a vector version of inputs to randperm to move the range from the default 1:N to N1:N2 but there isn't. Was trying to generalize.

For your case, just use

N=10;
p=randperm(N);
for i=1:N
  ...

If you do need integers from other than 1:N, scale the resulting array as needed.

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Answer 2

Jos (10584) 2014-7-2

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In matlab you can directly loop over a vector (no need for indexing)

V = randperm(10) % example vector
for x = V
   % x will iterate over the values of V
   disp(x)
end

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Souarv De 2021-10-8

That's nice.

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Answer 3

Juan Gonzalez 2021-4-13

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https://ww2.mathworks.cn/matlabcentral/answers/139713-generating-random-number-between-1-to-10#answer_673716

This is the easiest way

ceil(rand*10)

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dpb 2021-4-13

编辑：dpb 2021-4-13

But won't follow the request of OP to have sampling without replacement so that none can be repeated in the 10 samples.

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Answer 4

Elias Gule 2014-7-2

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N = 10; % size of the array
numArray = randperm(N); % array containing integers ranging from 1 : N
for k = numArray
   %%perform some calculation/process
   doSomething(k);
end