[R] how to add a line in the graph?

[David Winsemius]

On Dec 15, 2013, at 4:46 AM, 水静流深 wrote:

> t<--4:4
> y<-c(5,7,10,13,15,16,14,12,11)
> plot(t,y,type="l")
> 
> how can i add a curve  y=0.83*t-0.44*t^2  in the graph?
> 	[[alternative HTML version deleted]]

t<--4:4
y<-c(5,7,10,13,15,16,14,12,11)
plot(t,y,type="l", ylim=c(-4,16))

curve( 0.83*x-0.44*x^2 , add=TRUE, col="red")

-- 

David Winsemius
Alameda, CA, USA