select few values from a vector randomly

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

Answer 1

[Arif Hoq]

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

Answer 2

[Tushar Behera]

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)

[Elysi Cochin]

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]

take a look at the edited answer