Hi,
For splines to work effectively, you have to pass more than one point. Instead of the for loop which you were using, you could use the following code to plot data.
h = 0:0.1:50;
x = vertices(:,1);
y = vertices(:,2);
% xPath and yPath are variables taken from vertices of desired path
xPath = x(path(1:pathCount-1));
yPath = y(path(1:pathCount-1));
t = spline(xPath, yPath, h);
plot(xPath, yPath, h,y);
This way you can pass more than one point into spline function getting a smooth single curve. You could change start and end point and run spline again to replot the plot.
Refer to the following link to know more about splines
