When using datasample for random selection how to store the nonslected values in a separate array?

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elidzh5 2014-3-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/121873-when-using-datasample-for-random-selection-how-to-store-the-nonslected-values-in-a-separate-array

评论： elidzh5 2014-3-17

在 MATLAB Online 中打开

I have the following array:

A = {'E_1'; 'E_2'; 'E_3'; 'E_4'; 'E_5'; 'E_6'; 'E_7'; 'E_8'; 'E_9'; 'E_10'; 'E_11'; 'E_12'};

and I want to sample randomly from it 10 samples. To these 10 samples I assign values randomly between 0.8 and 1.

nsamples = 7;

    for i=1:nsamples
        y(:,i) = datasample(A,10,'Replace',false);
        y{1,i} = struct(y{1,i},[0.80 + 0.2*rand(1)]);
        y{2,i} = struct(y{2,i},[0.80 + 0.2*rand(1)]);
        y{3,i} = struct(y{3,i},[0.80 + 0.2*rand(1)]);
        y{4,i} = struct(y{4,i},[0.80 + 0.2*rand(1)]);
        y{5,i} = struct(y{5,i},[0.80 + 0.2*rand(1)]);
        y{6,i} = struct(y{6,i},[0.80 + 0.2*rand(1)]);
        y{7,i} = struct(y{7,i},[0.80 + 0.2*rand(1)]);
        y{8,i} = struct(y{8,i},[0.80 + 0.2*rand(1)]);
        y{9,i} = struct(y{9,i},[0.80 + 0.2*rand(1)]);
        y{10,i} = struct(y{10,i},[0.80 + 0.2*rand(1)]);
        %y{10,i} = struct(y{10,i},[0.80 + 0.2*rand(1)]);
    end

Then the samples that were not selected from array A I want to store them separately. What command should I use to separate the 2 that were not selected and to create for them a new array?

Please let me know if the question needs to be clarified?

Thanks, Elitsa

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Answer 1

Andrei Bobrov 2014-3-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/121873-when-using-datasample-for-random-selection-how-to-store-the-nonslected-values-in-a-separate-array#answer_128746

编辑：Andrei Bobrov 2014-3-17

在 MATLAB Online 中打开

A = regexp(sprintf('E_%d ',1:12),'\w*','match');
m = numel(A);
n = 7; % nsamples
k = 10;
[~,ii] = sort(rand(m,n));
y = cellfun(@(x,z)struct(x,z),A(ii(1:k,:)),num2cell(.8+.2*rand(k,n)),'un',0);

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elidzh5 2014-3-17

Hi Andrei,

Thank you for the answer.

The samples from A that were not selected (every time I have two that are left out), I want to store them separately. What command should I use to separate the 2 that were not selected and to create for them a new array? Because I also want to assign for them another randomly choosen values? Now I have y (10x7) for the 10 that are raddomly chosen but also i want to have the two left out (2x7). I don't know how to do that?

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