Scatterplot<-ggplot( diamonds[sample(nrow(diamonds), 1000), ], aes(carat, price, colour=clarity) )+ geom_point(position="jitter", alpha=0.6)+ facet_grid(~cut) + scale_x_continuous(breaks=seq(0, 5, 1)) + geom_boxplot(alpha=0, colour="black") + scale_color_brewer(palette = "Set1") plot(Scatterplot)

I cannot find any clue about this warning. Anyone knows? Please check the picture:

output

4

2 Answers

You can get around it with adding group = 1:

Scatterplot<-ggplot( diamonds[sample(nrow(diamonds), 1000), ], aes(carat, price, colour=clarity, group = 1) )+ geom_point(position="jitter", alpha=0.6)+ facet_grid(~cut) + scale_x_continuous(breaks=seq(0, 5, 1)) + geom_boxplot(alpha=0, colour="black") + scale_color_brewer(palette = "Set1") plot(Scatterplot)

This removes the error. However, I did not check if your overall approach to this plot makes sense (see comments).

Regarding why group = 1 is necessary: I would recommend this chapter in R for Data Science.

1

This happened to me because the x column wasn't character (it was numeric).

Simply mutate to character i.e.

mutate(myvariable = as.character(myvariable))

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