Select a random element of a vector and use randi command

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Eric Junaeus 2021-3-1

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编辑： Eric Junaeus 2021-3-2

What command should I use to randomly select an element from a vector and give it a random number by using the randi command while also displaying the other elements in the workspace?

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Answer 1

KSSV 2021-3-1

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https://ww2.mathworks.cn/matlabcentral/answers/759029-select-a-random-element-of-a-vector-and-use-randi-command#answer_635814

在 MATLAB Online 中打开

A = magic(5) ;
A = A(:) ;
N = numel(A) ;
idx = randi(N,1) ;
A(idx) = rand 

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Eric Junaeus 2021-3-2

编辑：Eric Junaeus 2021-3-2

在 MATLAB Online 中打开

Thanks for the reply!

I have made my own code based on yours:

A = zeros(1,10);
N = numel(A);
idx = randi(N);
A(idx) = randi(10); 

I would like to create a while loop that makes sure that as long there are any zeros in my vector, any of the elements will get a random number. I tried using any(A == 0) but it seems to give all elements at once a random number. Is it possible to add a random number to just one element at a time, save the value for that particular element, add another random number to any element, either to a different element or the same element that already has a random number (thus incrementing the random number to the already existing number) until all elements have a value of at least 1, necessitating the use of the all(A) command? Could if so could you also add comments to your code?

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