I want to make a full string from all the "a" values that i get

reversedDNA = 'TACATGA'

function complementedDNA = r_dnasepinaka(reversedDNA)

n=length(reversedDNA);

ok = num2cell(reversedDNA);

for i=1:n

a = ok{i};

for j = 1:length(a)

if a(j) == 'A';

a(j) = 'T';

elseif a(j) == 'T';

a(j) = 'A';

elseif a(j) == 'C'

a(j) = 'G';

elseif a(j) == 'G';

a(j) = 'C';

end

end

end

Answer 1

[Remy Lassalle-Balier]

I am not completly sure I understood your question but you could do something like this:

reversedDNA = 'TACATGA'
function complementedDNA = r_dnasepinaka(reversedDNA)
    complementedDNA = reversedDNA;
    complementedDNA(reversedDNA == 'T') = 'A';
    complementedDNA(reversedDNA == 'A') = 'T';
    complementedDNA(reversedDNA == 'C') = 'G';
    complementedDNA(reversedDNA == 'G') = 'C';
end

and something like this to get all the As:

function [UniqueCharStr , PositionList] = getSingleChar(DNA , Char)
    PositionList = find( DNA == Char );
    UniqueCharStr = DNA( PositionList );
end
getSingleChar(reversedDNA , 'A')

[IOANNIS KORACHAIS]

The first answear was exactly what i wanted, thank you very much

[Remy Lassalle-Balier]

You are welcome!

Answer 2

[Steven Lord]

reversedDNA = 'TACATGA'

reversedDNA = 'TACATGA'

DNA = replace(reversedDNA, {'T', 'A', 'C', 'G'}, {'A', 'T', 'G', 'C'})

DNA = 'ATGTACT'