Calculation mid point between two points

I have the following code.

s=pi/180; %to make radians.
i=1:100; %for 100 data points
t=3.6*s*i;          %360 degree in to radians
x=30*cos(t);      %parametric equation
y=15*sin(t);       %parametric equation
plot(x,y)

it calculates 100 points on a ellipse using parametric equations. I need help storing each point and calculating the distance of that point from the next point and measuring midpoint of that line (connecting two consecutive points).