How can the code memorize the generated vector?

Is there a quick way to memorize the generated out matrix in each iteration?

in1=[1 8 12] 
in2=[4 5 9]
out=[]
counter = 1
for i =1 :length(in1)
if in1(i)<in2(i)
out=in1(i):in2(i)
else
out=in1(i):-1:in2(i)
end
end

Answer 1

[KSSV]

in1=[1 8 12] 
in2=[4 5 9]
out=zeros(length(in1),[]) ;
counter = 1
for i =1 :length(in1)
if in1(i)<in2(i)
out(i,:)t=in1(i):in2(i)
else
out(i,:)=in1(i):-1:in2(i)
end
end

[GEORGIOS BEKAS]

error: p1080: A(I,J,...) = X: dimensions mismatch

[GEORGIOS BEKAS]

out=[]

and then it needs to be reshaped