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As title, I am getting geom_path: each group consists of only one observation. do you need to adjust the group aesthetic error. How can I fix it so the error goes away? Here is my code:
year pollution
1 1999 346.82000
2 2002 134.30882
3 2005 130.43038
4 2008 88.27546
plot5 <- ggplot(df, aes(year, pollution)) +
geom_point() +
geom_line() +
labs(x = "Year", y = "Particulate matter emissions (tons)", title = "Motor vehicle emissions in Baltimore")
'data.frame': 4 obs. of 2 variables:
$ year : num 1 2 3 4
$ pollution: num [1:4(1d)] 346.8 134.3 130.4 88.3
..- attr(*, "dimnames")=List of 1
.. ..$ : chr "1999" "2002" "2005" "2008"
structure(list(year = c(1, 2, 3, 4), pollution = structure(c(346.82,
134.308821199349, 130.430379885892, 88.275457392443), .Dim = 4L, .Dimnames = list(
c("1999", "2002", "2005", "2008")))), .Names = c("year",
"pollution"), row.names = c(NA, -4L), class = "data.frame")
When I operate it and I received the error text:
geom_path: Each group consist of only one observation. Do you need to adjust the group aesthetic?
I appreciate any help from you.
A simple way is to add ‘group=1’ into the aes() function
It resolves the problem because you’d like to get the data points connected, so you must specify ‘group=1’
This error is caused by a factor variable. Execute
This is to be confirmed. Do the double variable change again to keep the year numbers, and not transform them into “1,2,3,4” levels.
EDIT: It appears that your data.frame contains a variable of type “array”, which could cause the pb. You might try this:
Only
group = 1
is required in the ggplot and geom_line AES().For line graphs, the data points must be grouped so that it knows which points to connect. In this case, it is simple — all points should be connected, so group=1. When more variables are used and multiple lines are drawn, the grouping for lines is usually done by variable.
This is what you can do: