convert a matrix with some zero to non zero txt file

for example I have this matrix: [ 1 2 3 ; 1 0 0 ; 0 0 0; 4 5 6] I want to save it to a txt file: 1 2 3 1 4 5 6 (also delete zero rows completely.)

Answer 1

[Azzi Abdelmalek]

a=[ 1 2 3 ; 1 0 0 ; 0 0 0; 4 5 6] I
for k=1:size(a,1)
  b=a(k,:)
  b=b(b~=0);
  dlmwrite('file1.txt',b,'-append')
end