syms B F S W P O E M D A T G H J C
A2=[34615*1矩阵，以上述十五个字母构成];
M=reshape(A2,43,805);
%A=strvcat(Q);
A1=str2num(M);
X2=zeros(size(M));
%X1=num2str(X2);
[m,n]=size(M);
%M2=subs(M)
%M1=str2double(M2);
for i=1:n
    X2(:,i)=A1(1,i);
end
X2;
%for i=1:m
   % for j=1:n
    %    Y1(i,j)=X1(i,j);
%   end
%end
%Y1;
D2=reshape(X2,34615,1);