MATLAB将数字放入matlab，从矩阵到字符串

Question

我在解密部分遇到问题（不是真正的加密）

prompt = 'Enter a sentence you would like to Encrypt';
dlg_title = 'Input';
num_lines = 5;
defaultans = {'Hello'};
answer = inputdlg(prompt,dlg_title,num_lines,defaultans);

answer = answer{1};




% find out how big the square matrix for data should be
for i = 1:length(answer) % it should never run this far anyway
   if (i^2) > length(answer) 
       break;
   end
end

mat_len = i; 

% predefine square matrix of numbers forcing matrixA to number type
matrixA = zeros(mat_len,mat_len); 

% iterate through square matrix assigning answer values to positions
for i = 1:mat_len
    for j = 1:mat_len
        if (((i-1)*mat_len)+j) <= length(answer)
         matrixA(i,j) = answer(((i-1)*mat_len)+j);
        else
            break;
        end
    end
end
matrixA(1)=matrixA(1)*10
matrixA'

我的问题是我不知道如何将矩阵恢复为字符串。比如

   720   108     0
   101   111     0
   108     0     0

当输入代码时应该是＆＃34; Hello＆＃34;，但我不知道该做什么或如何启动解密部分，我怎样才能将ASCII代码输回到matlab并得到字符串？