Repeat array onto the same row

I want A=[1,2,3,4] to

become A=[1,2,3,4,1,2,3,4] by x2

or

become A=[1,2,3,4,1,2] by x1.5

is it possible?

Answer 1

[Paul]

A=[1,2,3,4]

A = 1×4

1 2 3 4

horzcat(A,A)

ans = 1×8

1 2 3 4 1 2 3 4

horzcat(A,A(1:floor(numel(A)/2)))  % or use ceils depending on how you want to handle the case where numel(A) is odd

ans = 1×6

1 2 3 4 1 2

[Leonardo]

Thank you!

Answer 2

[Dyuman Joshi]

Here's a generalised code -

A=[1,2,3,4];

B = repetition(A,2)

B = 1×8

1 2 3 4 1 2 3 4

B = repetition(A,1.5)

B = 1×6

1 2 3 4 1 2

B = repetition(A,2.75)

B = 1×11

1 2 3 4 1 2 3 4 1 2 3

B = repetition(A,3.3)

Error using solution>repetition
Incompatible number for repetition

function B = repetition(A,n)
B = repmat(A,1,ceil(n));
k = numel(A)*n;
    %k needs to be an integer to repeat an array by a non-integer number
    %Check for a number being an integer is the reminder when divided by 1 is zero
    if rem(k,1)
        error('Incompatible number for repetition');
    else
        B = B(1:k);
    end
end

[Leonardo]

Thank you!