Why the mean value " h" is not changing as the slider moves from 0 to 25 ?.
It remains always constant.
library(manipulate)
example <- function(x.max){
plot(cars, xlim=c(0,x.max))
abline(h=mean(cars$dist),col="blue",lty=2) }
manipulate(
example(x.max), x.max=slider(0,25, step=5) )
veepsirtt
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