How an array with 'n' elements, and replicate each element 'm' times and then replace it in the array ?

Hello I need some help, I have a random array of e.g. 10 elements

A= [1 -1 1 1 -1 -1 -1 1 1 -1],

I want to replicate each element in the e.g. 3 times so new array becomes becomes like

B= [1 1 1 -1 -1 -1 1 1 1 1 1 1 -1 -1 -1 .......] and so on,

Can anyone tell me which function would be suitable or any logic that can be applied, as the random array has originally longer lengths and the replication values are higher. I don't want to replicate the whole array 'm' times but each element in array should be replicated as 1 replicated and replaced by 1 1 1 and -1 would be as -1 -1 -1.

Any help would be really appreciated.

Answer 1

[Azzi Abdelmalek]

A= [1 -1 1 1 -1 -1 -1 1 1 -1],
B=repmat(A,3,1);
B=B(:)'

%or

A= [1 -1 1 1 -1 -1 -1 1 1 -1],
B=reshape(repmat(A,3,1),1,[])

Answer 2

[Jos (10584)]

A = [1 4 3 2]
m = 3 
B = kron(A, ones(1,m))

Answer 3

[Image Analyst]

If you have the Image Processing Toolbox:

B = imresize(A, [1, 3*size(A,2)], 'nearest')

[Haseeb Mufti]

Thanks a lot, I am using it for BPSK modulation, with an array of random size and random elements.

 If I have a larger array of more than 1000 elements should I use the length function and defined the length and then repmat it

[Image Analyst]

I don't see why you need to do that if you can use imresize().

[Image Analyst]

Since you now accepted the repmat answer I guess you don't have the IPT. But that's fine, whatever works.