MATLAB: I want to convert the numbers in the matrix as the letter .

Question

Hello . I do code but it runs off a single character , I want it to run all out. What to do?

B=input('Enter martrix:');

switch B(1,1)

    case{1}
        disp('A');
    case{2}
        disp('B');
    case{3}
        disp('C');
    case{4}
        disp('D');
    case{5}
        disp('E');
    case{6}
        disp('F');
    case{7}
        disp('G');
    case{8}
        disp('H');
    case{9}
        disp('I');
    case{10}
        disp('J');
    case{11}
        disp('K');
    case{12}
        disp('L');
    case{13}
        disp('M');
    case{14}
        disp('N');
    case{15}
        disp('O');
    case{16}
        disp('P');
    case{17}
        disp('Q');
    case{18}
        disp('R');
    case{19}
        disp('S');
    case{20}
        disp('T');
    case{21}
        disp('U');
    case{22}
        disp('V');
    case{23}
        disp('W');
    case{24}
        disp('X');
    case{25}
        disp('Y');
    case{26}
        disp('Z');
    case{27}
        disp('.');
    case{28}
        disp('?');
    otherwise
        disp(' ');
end

Answer 1

b=input('enter a number');
str=['A':'Z'  '.?']
if ismember(b,1:28)
  out=str(b)
  disp(out)
else
  disp('  ')
end