Generation of random number which needs to be passed to an array

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Ganesh Kini 2020-6-15

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https://ww2.mathworks.cn/matlabcentral/answers/548820-generation-of-random-number-which-needs-to-be-passed-to-an-array

回答： Rik 2020-6-15

I have 2 variables named A and B

A has the range from -0.2 to 2.2

B has the range from -3.2 to 0.2

I need all the possible to combinations of A and B in 0.1 steps

for example

FROM

0.1 0.2

-0.1 -0.3 and so on

How do I randomly generate this?

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James Tursa 2020-6-15

By randomly, do you mean you want to randomly pick one pair from all possible pairs? Or do you mean you want to generate the set of all possible pairs but then randomly mix them up?

Ganesh Kini 2020-6-15

编辑：Ganesh Kini 2020-6-15

Thank you for your reply

I want all the sets of randomly mixed values and then I need to iterate them

So, there are two questions

1) How do I randomly pick one set of A and B and then pass it on the array?

2) How do I iterate all the sets of values without using for loop?

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Answer 1

Rik 2020-6-15

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https://ww2.mathworks.cn/matlabcentral/answers/548820-generation-of-random-number-which-needs-to-be-passed-to-an-array#answer_451668

在 MATLAB Online 中打开

You can generate all combinations and mix them up like this:

[A,B]=ndgrid(-0.2:0.1:2.2,-3.2:0.1:0.2);
new_order=randperm(numel(A));
A=A(new_order);
B=B(new_order);

Now you can feed it to your next function. Whether you are able to avoid for-loops depends on what function you are trying to call. (and it may not be the optimal strategy to do so at any cost)