CODEWITHSUNDEEP
rggplot2plot
bananabenana
bananabenana

Reputation: 17

Using ggplot to plot multiple lines along the x-axis, coloured by their group but remaining seperate

I want to use ggplot to create a line graph, with the values of each 'Molecule' represented by a different line. I want to use 'Family' to colour each line. I am having issues with this and can't seem to represent the individual values as separate lines, nor colour them based on their family.

df.long = melt(df, id.vars = c("Molecule", "Family"), measure.vars = c(3:7))
ggplot(df.long, aes(variable, value)) + geom_line(aes(colour = Molecule)

I end up plotting something like this:

enter image description here

If someone could help me work this out, I would appreciate it.

This is how my data is organized, in wide format:

Molecule Family Pos1 Pos2 Pos3 Pos4 Pos5
A i 2.178 1.289 0.656 0.956 0.711
B ii 1.478 0.889 0.578 0.689 0.444
C ii 1.389 1.078 1.189 0.944 1.844

Upvotes: 0

Views: 383

Answers (1)

stefan
stefan

Reputation: 124183

To get separate lines for each Molecule you have to map Molecule on the group aes:

library(ggplot2)
library(reshape2)

df <- read.table(text = "Molecule   Family  Pos1    Pos2    Pos3    Pos4    Pos5
A   i   2.178   1.289   0.656   0.956   0.711
B   ii  1.478   0.889   0.578   0.689   0.444
C   ii  1.389   1.078   1.189   0.944   1.844", header = TRUE)

df.long = melt(df, id.vars = c("Molecule", "Family"), measure.vars = c(3:7))
ggplot(df.long, aes(variable, value)) + geom_line(aes(colour = Family, group = Molecule))

Upvotes: 1

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