CODEWITHSUNDEEP
rggplot2plot
Christian Schano
Christian Schano

Reputation: 89

avoid zig-zag pattern in quadratic fit in ggplot

I struggle with plotting a quadratic fit in ggplot, as the line between the overlapping x-values jumps back and forth between the upper and lower side of the curve.

enter image description here

However, doing the same in base plot, it works, which makes me think I am overlooking something (possibly really stupid) in ggplot. Could anybody guide me towards how to receive a propper line in ggplot?

enter image description here

I unfortunately don`t know how to reproduce the exact problem, so just add code for a similar shaped "curve":

library(ggplot2)
x1 <- log(c(1:100, 99:1))
y1 <- log(seq(0.22, 0.2, length.out = 199))
dat <- data.frame(x = x1, y = y1)
ggplot(data = dat, aes(x = x, y = y)) + geom_line()
plot(y1 ~ x1, type = "l")

Thanks a lot in advance!

Upvotes: 0

Views: 211

Answers (1)

itsDV7
itsDV7

Reputation: 854

Try geom_path() instead.

library(ggplot2)
x1 <- log(c(1:100, 99:1))
y1 <- log(seq(0.22, 0.2, length.out = 199))
dat <- data.frame(x = x1, y = y1)
ggplot(data = dat, aes(x = x, y = y)) + geom_path()
plot(y1 ~ x1, type = "l")

geom_path() connects the observations in the order in which they appear in the data. geom_line() connects them in order of the variable on the x axis. Documentation.

Upvotes: 3

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