functions for adding middle points on lines or bends

it is useful for points distribution in wireless sensor networks ,..

%[X,Y]=divider(X,Y,n,isFair)
%[X,Y,Z]=divider(X,Y,Z,n,isFair)

x=[1,1,3,3,1];
y=[2,4,4,2,2];
z=[1,1,2,1.2,1];

[X1,Y1]=divider(x,y,1,0);
subplot(1,2,1);plot(x,y,'-*')
xlim([0,4]);ylim([0,5]);

subplot(1,2,2);plot(X1,Y1,'-*')
xlim([0,4]);ylim([0,5]);

figure;
[X2,Y2,Z2]=divider3(x,y,z,1,0);
subplot(1,2,1);plot3(x,y,z,'-*')
xlim([0,4]);ylim([0,5]);

subplot(1,2,2);plot3(X2,Y2,Z2,'-*')
xlim([0,4]);ylim([0,5]);zlim([0,4]);