Change random values in the matrix of 234*10000

Question

Harsh Rob 2020-2-7

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https://ww2.mathworks.cn/matlabcentral/answers/504177-change-random-values-in-the-matrix-of-234-10000

评论： Harsh Rob 2020-2-7

I have a matrix of 10*10 (in this example, actually the matrix is 234*10000) and I have to change the values at random locations.

I tried using the randperm function but it is able to change the values only in the beginning locations. Could someone advise on this please

X= rand(10)
shi=randperm(10,3); %For 10000 simulations and limiting the jump to go only upto 1673
Initial_X = X(shi);
X(shi) = randperm(5,length(shi)); %Change the values at these values of 'i' which is derived from the randperm function above
Final_X = X(shi); 

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Answer 1

KSSV 2020-2-7

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https://ww2.mathworks.cn/matlabcentral/answers/504177-change-random-values-in-the-matrix-of-234-10000#answer_414297

在 MATLAB Online 中打开

You should follow like this:

X= rand(10)
shi=randperm(numel(X),3); %For 10000 simulations and limiting the jump to go only upto 1673
Initial_X = X;
X(shi) = rand(size(shi)); %Change the values at these values of 'i' which is derived from the randperm function above
Final_X = X; 

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Bhaskar R 2020-2-7

在 MATLAB Online 中打开

X(shi) = randi([your big number limit], size(shi));

Harsh Rob 2020-2-7

Thanks KSSV and Bhaskar. It works for me now.

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Answer 2

Bhaskar R 2020-2-7

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https://ww2.mathworks.cn/matlabcentral/answers/504177-change-random-values-in-the-matrix-of-234-10000#answer_414295

在 MATLAB Online 中打开

X= rand(10);    % total locations, 10*10 = 100;
loc = randperm(numel(X), 1);    % out of 100 locations i pick one random location choosen
X(loc) = rand(1);     % assigning random value to randomly picked location

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Harsh Rob 2020-2-7

No it does not work. I used the same logic. So basically, this new random number introduced should be a higher number so that I can differentiate. Also, I have to make this changes at say 10 random places in the 10*10 matrix with a bit higher values.

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