creating a function via a list

I am unable to get my function object to respond to a list. I have tried with and without preceding the x,y values with set. For example, I expect the following to create piece-wise linear function beginning at 0.0, a line to 1.0 in 90ms, a line to 0.6 in 89ms, a line to 0.55 in 380ms, and a line to 0.0 in 200ms. Domain is set to 1000 and range 1.0. What am I getting wrong?
set 0. 0. 90 1. 89 0.6 382 0.55 200 0.