On Jan 3, 2011, at 9:52 AM, Muhammad Rahiz wrote:
Hi all,
I'm trying to get the value of y when x=203 by using the intersect
of three curves. The horizontal curve does not meet with the other
two. How can I rectify the code below?
Extend the appropriate axes. xlim and ylim are the arguments to use.
Looks too much like a homework problem for me to do the work for you,
though.
Thanks
Muhammad
ts <- 1:10
dd <- 10:1
ts <- seq(200,209,1)
dd <- c(NA,NA,NA,NA,1.87,1.83,1.86,NA,1.95,1.96)
plot(ts,dd,ylim=c(1.5,2))
abline(lm(dd~ts),col="blue",lty=2)
abline(v=203,col="blue",lty=2)
xy <- lm(dd~ts)
fc <- function(x) coef(xy)[1] + x*coef(xy)[2]
val <- optimize(f=function(x) abs(fc(x)-203),c(1.5,2))
abline(h=val,col="blue",lty=2)
David Winsemius, MD
West Hartford, CT
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