M=828120;
F=1293.3;
F2=2587.89;
l=2560;
E=210000;
d=72;
I=(3.14*d.^4)/64;
x1=0:0.1:l/2;
w1=(F/6*x1.^3-M/2*x1.^2)/(E*I);

x2=l/2:0.01:l;
w2=(F/6*x2.^3-M/2*x2.^2 -F2/6*(x2-l/2).^3)/(E*I);


x=[x1 x2];
w=[w1 w2];

grid on
plot (x,w)
xlim([0 2560])
ylim([-1 0.2])
ybounds = ylim()
set(gca, 'ytick', ybounds(1):0.2:ybounds(2))
xlabel('l [mm]')
ylabel('Biegung [mm]')
pbaspect([3 1 1])
export_fig Biegelinie -pdf -transparent -r300 -painters