Issues plotting multiple columns into a single plot

Question

I used this link to find some code to plot multiple columns into one plot, but when I tried using the code I get a plot with everything but the data points and this error message

"geom_path: Each group consists of only one observation. Do you need to adjust the group aesthetic?"

original data

converted data

the code I used:

df <- melt(Cooks_Farm_Cations_2017, id.vars = 'Site', variable.name = "Cation")

pa1<-ggplot(df, mapping=aes(Site,value)) + geom_line(aes(color=Cation))+ylab("mg/L")

My goal is to get a line plot of my 4 cations(y) for each sample site (x). Any help would be greatly appreciated.

try adding group = Cation like so: geom_line(aes(color=Cation, group = Cation)). If that doesn't work, use geom_line(aes(color=Cation), group = 1) — Dij
– Dij, Commented May 8, 2020 at 0:44
I put the information in an answer--go ahead and accept it so others with the same question can make use of yours--thanks! — Dij
– Dij, Commented May 8, 2020 at 0:56

Dij · Accepted Answer · 2020-05-08 00:54:49Z

1

To draw parallel coordinates, you can make use of geom_line's group aesthetic

ggplot(df, mapping=aes(Site,value)) + 
  geom_line(aes(color=Cation, group = Cation)) + 
  ylab("mg/L")

answered May 8, 2020 at 0:54

Dij

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