[Plplot-general] Problem with examples in c in tutor.c

[Javier G. L. <j_...@ab...>]

I can compiled tutor.c and i have created the file that needs it in the right 
way. However, i can`t see points united by lines as i think it must be as 
follows in the code:

for (i = 0; i < M; i++) {
        plpoin(N, x, y[i], i + OFFSET);
        plline(N, x, y[i]);
    }

Should i see points united by lines? Why i dont see then?