matlab - plot from data not a function -


if plot 

sin(x*y)

you see lines.
if u have coordinates of points of these lines , want plot theme
(connecting dots without using sin(x*y) function), how possible?
codes, try obtain coordinates of each 'x'(beta-bar) each 'lam' and
save roots in matrix. 

clc; clear;     lmin=0.8;       lmax=2.5;   bmin=1;            bmax=1.5;   lam=linspace(lmin,lmax,100);   n=length(lam):-1:1       increment=0.001;  tolerence=1e-14; xstart=bmax-increment;       x=xstart;       dx=increment;       m=0;       while x > bmin           while dx/x >= tolerence               if sign(f(lam(n),x))*sign(f(lam(n),x-dx))<0                   dx=dx/2;               else                   x=x-dx;               end           end           m=m+1;           r(m,n)=x;           dx=increment;           x=0.999*x;       end   end        figure   hold on,plot(lam,r(1,:),'b')   plot(lam,r(2,:),'c')   plot(lam,r(3,:),'r')   xlim([lmin,lmax]);ylim([bmin,bmax]),   xlabel('\lambda(\mum)'),ylabel('\beta-bar')

and
function y=f(x,y)
y=sin(4*x*y);
end

what wrong it?
how separately plot each line?

use plot(x1,y1,...,xn,yn) see link more details http://www.mathworks.com/help/techdoc/ref/plot.html


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