First One:
A=[1 2 7 9] => how to build A like this> A=[1 1 2 2 7 7 9 9]
result=repelem(A,2)
2nd One:
>> A=[1 2 7 9];
>> B=[3 5 6 8 10 11];
>> c1=[A,B];
>> C=c1(randperm(10))
%.................^.....length Required
C =
5 1 6 9 10 3 8 7 11 2
Or Check here
>> A=[1 2 7 9];
>> A=repelem(A,2)
A =
1 1 2 2 7 7 9 9
>> B=[3 5 6 8 10 11];
>> c1=[A,B];
>> C=c1(randperm(length(c1)))
C =
8 1 11 5 10 9 3 1 7 6 9 7 2 2
