I have a trajectory that consists of 42 x,y coordinates;

I need to downsample these coordinates into 11 x,y points;

Just wonder if there is a function in R that can do that for me.

the data is :

x-coordinate

x= c(1.07,0.98,0.90,0.81,0.73,0.65,0.57,0.49,0.41,0.33,0.25,0.17,0.1,0.01,-0.06,
-0.14,-0.21,-0.28,-0.36,-0.43,-0.49,-0.54,-0.59,-0.63,-0.66,-0.69,-0.72,-0.73,
-0.72,-0.70,-0.67,-0.64,-0.61,-0.63-0.64,-0.65,-0.65,-0.65,-0.65,-0.66,-0.66,
-0.64)

y-coordinate

y=c(-0.11,-0.09,-0.10,-0.12,-0.13,-0.14,-0.19,-0.21,-0.22,-0.24,-0.26,-0.28,-0.30,
-0.32,-0.34,-0.37,-0.41,-0.45,-0.50,-0.55,-0.61,-0.68,-0.76,-0.84,-0.92,-1.00,
-1.08,-1.18,-1.28,-1.38,-1.47,-1.56,-1.61,-1.67,-1.73,-1.79,-1.85,-1.91,-1.96,
-2.02,-2.07)