MATLAB: Addition of string matrices.

Question

I want to duplicate a string matrix.

When I use M=[M M] I get

M =

    'Ssu (kg COD/m³)'    'Ssu (kg COD/m³)'
    'Saa (kg COD/m³)'    'Saa (kg COD/m³)'
    'Sfa (kg COD/m³)'    'Sfa (kg COD/m³)'

but I want this

M =

    'Ssu (kg COD/m³)'
    'Saa (kg COD/m³)'
    'Sfa (kg COD/m³)'
    'Ssu (kg COD/m³)'
    'Saa (kg COD/m³)'
    'Sfa (kg COD/m³)'

Answer 1

M ={
'Ssu (kg COD/m³)'    'Ssu (kg COD/m³)'
'Saa (kg COD/m³)'    'Saa (kg COD/m³)'
'Sfa (kg COD/m³)'    'Sfa (kg COD/m³)'};
out = M(:);

or

out = reshape(M,[],1);

OR

M ={
  'Ssu (kg COD/m³)' 
  'Saa (kg COD/m³)' 
  'Sfa (kg COD/m³)' };
out = [M;M];

or

out = repmat(M,2,1);