Question

I have a text file, that is formatted somewhat like this:

1 2 3 4 5 6
7 8 9
0 11 2 32 45 6 6
1 2

I want to read each row and plot a line for each row.The x axes is [1:row.length],the y axes is each row.

Answer 1

fid = fopen('dat.txt');

line = fgetl(fid);

% if you want everything on the same axis, set it up here
axis([0,20,-10,10])
hold all    

while ischar(line)
  yy = str2num(line);
  xx = 1:length(yy);
  plot(xx,yy)
  line = fgetl(fid);
end
hold off

fclose(fid);

Note that feof() is not so good with fgetl(), see here.