Question

I plot Iris data with ggplot2. It seems ggplot2 will standardized the data to (0.1) interval automatically. How can I plot the data without any standardized manipulation?

library(ggplot2)
p <- ggpcp(iris, vars = names(iris[1:4]))
p + geom_line(aes(color = Species)) + ylim(0,8)

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I am not a native English speaker and I am sorry to make ambiguity. Actually, the iris data various from 0 to 8. I want to plot the data exactly reflected the real value, but not the standardized value (transform the original data to (0,1) interval).

Answer 1

Maybe:

library(ggplot2)
p <- ggpcp(iris, vars = names(iris[1:4]))
iris2 <- data.frame(id=1:nrow(iris), iris)
dat <- reshape2::melt(iris2,id.var = c("id", "Species"))
ggplot(aes(y=value, x=variable, group=id, color=Species), data=dat) + geom_path()

Though there may be better ways. Never did this so it was fun trying.