Utku - I suppose that you would want to plot the m that is generated on each iteration of the loop. If that is the case, you could save that data to an array and plot that array when you exit the loop like
iter = 1;
mData = []; % create an array
while (abs(a-b)>tol)
fa = 2*sin(a) + 2*cos(a);
fb = 2*sin(b) + 2*cos(b);
m = (a+b)/2;
fm = 2*sin(m) + 2*cos(m);
if (fa*fm<0)
b=m;
else
a=m;
end
mData[iter] = m; % save data to array
iter = iter + 1 ;
fprintf('%d \t %f \f \t %f \t %f \t %f\n',iter,a,b, abs(a-b),tol);
end
plot(mData); % plot data
