Matlab - Mostrar N/A y guardar como 0

function uitables100_OpeningFcn(hObject, eventdata, handles, varargin)

A={'10','N/A', '340';

    '-90','30', 'N/A';

    '900','-3.6','34';

     'N/A','45','45'}

set(handles.uitable1,'Data',A)

 for i=1:size(A,1)

    for j=1:size(A,2)

       B(i,j)=str2double(A{i,j});

    end

 end

A=B;

U=isnan(A);

A(U)=0;

A

function uitables100_OpeningFcn(hObject, eventdata, handles, varargin)

a=[1500 0 0

   750 0 0

   375 0 0]

for i=1:size(a,1)

    for j=1:size(a,2)

        if a(i,j)~=0

           A{i,j}=num2str(a(i,j));

        else

          A{i,j}='N/A';

        end

    end

end

set(handles.uitable1,'Data',A)

 for i=1:size(A,1)

    for j=1:size(A,2)

       B(i,j)=str2double(A{i,j});

    end

 end

a=B; U=isnan(a); a(U)=0;

a