How to create a matrix from for loop result?

I repelem the element by the index

D = [170, -80, -30, 0, -50, -30, 20, -60, 100, -60 -20];
Iplus=find(D>0);

for i=1:size(Iplus,2)
    a=ceil(D(Iplus(i))/100);   
    A=repelem(Iplus(i),a*2)
end

How can I store all result as below into one matrix? like A=[1 1 1 1 7 7 9 9]

A =
     1     1     1     1
A =

     7     7

A =
     9     9

Answer 1

[Jos (10584)]

D = [170, -80, -30, 0, -50, -30, 20, -60, 100, -60 -20];
Iplus=find(D>0);
A = [] ;           % initialize
for i=1:size(Iplus,2)
    a=ceil(D(Iplus(i))/100);   
    Anew = repelem(Iplus(i),a*2)
    A = [A Anew]   % append
end

Note that Matlab will warn you, because A is growing every iteration. With some thinking you might be able to optimise or even vectorise this piece of code.

[Hang Vu]

Thank you so much for the help!^^