Matlab - mover lineas de un fichero de texto

clear all;clc;

datos = fopen('texto.txt','r');

n=1;

while ~feof(datos)

   leer_linea = fgetl(datos);

   if isempty(leer_linea) || ~ischar(leer_linea), break, end

   C(n)= cellstr(leer_linea);

   n=n+1;

end

C=C';

C=str2num(cell2mat(C));

tam=size(C);

nfilas=tam(1);

k=1;

for n=1:2:nfilas-1

    N(k,:)=horzcat(C(n,:),C(n+1,:));

    k=k+1;

end

fclose(datos);

dlmwrite('texto1.txt',N,'delimiter','\t');

dlmwrite('texto1.txt',N,'delimiter','\t','newline','pc');

??? Error using ==> cat

CAT arguments dimensions are not consistent.

Error in ==> cell2mat at 89

            m{n} = cat(1,c{:,n});

Error in ==> prueba_borrar>pushbutton2_Callback at 118

C=str2num(cell2mat(C));

>>convertir_dos_lineas_en_una_linea1

2.5 1.2 7.8 2.0 -1.9 2.4  -1.97 2.5 25

 2.5 1.17 7.5 2.01 -1   -1.98 2.41 25

2.5 1.2 7.8 2.0 -1.9 2.4 -1.97 2.5 25 2.5 1.17 7.5 2.01 -1 -1.98 2.41 25