select few values from a vector randomly

Question

Elysi Cochin 2023-2-1

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1904450-select-few-values-from-a-vector-randomly

编辑： Tushar Behera 2023-2-1

v1 = [3 4 7 14 15 18 23 25 28 31 34 36 37 38 39 40 42 44 46];
v2 = [1  2  5  6  8  9 10 11 12 13 16 17 19 20 21 22 24 26 27 29 30 32 33 35 41 43 45 47];

I have 2 vectors v1 and v2

v1 has 19 columns and v2 has 28 columns

I wanted to create a new vector v of size 25 with all elements of v1 and if the size of v is not 25 I need to select few numbers from v2 randomly so as to make the size of v = 25 and write it in a sorted order

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Answer 1

Arif Hoq 2023-2-1

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https://ww2.mathworks.cn/matlabcentral/answers/1904450-select-few-values-from-a-vector-randomly#answer_1161115

在 MATLAB Online 中打开

try this:

v1 = [3 4 7 14 15 18 23 25 28 31 34 36 37 38 39 40 42 44 46];
v2 = [1  2  5  6  8  9 10 11 12 13 16 17 19 20 21 22 24 26 27 29 30 32 33 35 41 43 45 47];
target=25;
matsise=numel(v2);
a=v2(randperm(matsise,target -length(v1)));
v=sort([v1 a],'ascend')
v = 1×25
     3     4     6     7     8    14    15    18    19    23    25    28    29    30    31    34    35    36    37    38    39    40    42    44    46

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Answer 2

Tushar Behera 2023-2-1

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1904450-select-few-values-from-a-vector-randomly#answer_1161085

编辑：Tushar Behera 2023-2-1

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Are you looking for something like this

v1 = [3 4 7 14 15 18 23 25 28 31 34 36 37 38 39 40 42 44 46];
v2 = [1  2  5  6  8  9 10 11 12 13 16 17 19 20 21 22 24 26 27 29 30 32 33 35 41 43 45 47];
v1=unique(v1);
v2=unique(v2);
num1=numel(v1);
num2=numel(v2);
v=zeros(1,25);
v=[v1]
if num1<25
    for i=(num1+1):25
        index = randi(numel(v2));
randomElement = v2(index);
if ismember(randomElement,v1)
        %do nothing
else
    v(i)=randomElement;
end
    end
end
v=sort(v)

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Elysi Cochin 2023-2-1

编辑：Elysi Cochin 2023-2-1

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Sir, the values in output v repeats

v =
Columns 1 through 19
1     3     4     5     5     6     7    10    11    13    14    15    16    16    16    20    20    24    27
Columns 20 through 25
33    35    35    41    41    45