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select few values from a vector randomly

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Elysi Cochin
Elysi Cochin am 1 Feb. 2023
Bearbeitet: Tushar Behera am 1 Feb. 2023
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

Akzeptierte Antwort

Arif Hoq
Arif Hoq am 1 Feb. 2023
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

Weitere Antworten (1)

Tushar Behera
Tushar Behera am 1 Feb. 2023
Bearbeitet: Tushar Behera am 1 Feb. 2023
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)
  2 Kommentare
Elysi Cochin
Elysi Cochin am 1 Feb. 2023
Bearbeitet: Elysi Cochin am 1 Feb. 2023
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
There should be no repetition in vector v.
All elements should be unique and values should be from v1 and v2 only
Tushar Behera
Tushar Behera am 1 Feb. 2023
take a look at the edited answer

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