big horizontally symmetric number

%given a number x.calculate the smallest positive number you need to add to your original number so that each digit in your sum will have horizontal symmetry.those numbers are [0 1 3 8]

%example x=27=> output =3 because 27+3=30 (horizontal symmetry)

%my code is success with small number,but with big number it is out of memory,so how could i fix it

function y = symmetry(x)
c=x
for i=1:inf
    a=num2str(x);
    b=uint64(zeros(1,length(a)));
    for j=1:length(a)
        b(j)=str2num(a(j));
    end
    b=b(b~=0);
    b=b(b~=1);
    b=b(b~=3);
    b=b(b~=8);
    if isempty(b)==1
        break
    end
    x=x+1;
end
y=x-c
end

%take example of big number is x=34567890

[KSSV]

Why 3 should be added to 27 to get 30? How 30 is horizontal symmetric? Question is not clear. Can you give another example?

Answer 1

[Nguyen Huy]

horizontal symmetric is when you have a line divine the number into 2 part,the upper part and lower part look the same

Example: 30 because 30=> ) /\

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) \/

Example2: add 100 to 900 to get horizontal symmetric number 900+100=1000=> | /\ /\ /\

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| \/ \/ \/

[Nguyen Huy]

@KSSV