Multiple Line charts in R using ggplot2 package

Question

This is my data . I want to create multiple line charts for the different variables . The long form of the data is being created using "melt" from "reshape2" package .

The current code I am using is :

ggplot(data = agg_melt_p, aes(x=Cat, y=value)) + geom_line(aes(colour=variable))

This gives me the following error: geom_path: Each group consists of only one observation. Do you need to adjust the group aesthetic?

Data:

Cat <- c(1,2,3,4,1,2,3,4,1,2,3,4,1,2,3,4,1,2,3,4)

variable <- c("IL_1_Flag_p", "IL_1_Flag_p", "IL_1_Flag_p", "IL_1_Flag_p", "IL_2_Flag_p", "IL_2_Flag_p", "IL_2_Flag_p","IL_2_Flag_p", "IL_3_Flag_p", "IL_3_Flag_p", "IL_3_Flag_p", "IL_3_Flag_p", "IL_4_Flag_p", "IL_4_Flag_p", "IL_4_Flag_p", "IL_4_Flag_p", "IL_5_Flag_p", "IL_5_Flag_p", "IL_5_Flag_p", "IL_5_Flag_p")

value <- c(21,17,16,210,20,17,15,189,20,17,15,188,19,17,15,188,20,17,15,194)

agg_melt_p <- data.frame(cat, variable, value)

try group = variable in the geom line aes?

Scientist_jake
– Scientist_jake

2018-01-18 09:09:34 +00:00
Commented Jan 18, 2018 at 9:09 — Scientist_jake
– Scientist_jake, Commented Jan 18, 2018 at 9:09
Your code works, given the data snapshot you provided

tifu
– tifu

2018-01-18 09:12:39 +00:00
Commented Jan 18, 2018 at 9:12 — tifu
– tifu, Commented Jan 18, 2018 at 9:12

Eric Fail · Accepted Answer · 2018-01-18 18:11:05Z

1

both your code, using colour=variable, and Scientist_jake's suggestion to use group = variable, works for me. As follows,

agg_melt_p <- data.frame(cat = c(1, 2, 3, 4, 1, 2, 3, 4, 
                  1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4),
              variable = c("IL_1_Flag_p", "IL_1_Flag_p", "IL_1_Flag_p", "IL_1_Flag_p",
                 "IL_2_Flag_p", "IL_2_Flag_p", "IL_2_Flag_p","IL_2_Flag_p", "IL_3_Flag_p",
                 "IL_3_Flag_p", "IL_3_Flag_p", "IL_3_Flag_p", "IL_4_Flag_p", "IL_4_Flag_p",
                 "IL_4_Flag_p", "IL_4_Flag_p", "IL_5_Flag_p", "IL_5_Flag_p", "IL_5_Flag_p",
                 "IL_5_Flag_p"),
              value = c(21, 17, 16, 210, 20, 17, 15, 189, 20, 17,
                       15, 188, 19, 17, 15, 188, 20, 17, 15, 194))

# install.packages(c("ggplot2"), dependencies = TRUE)
library(ggplot2)

ggplot(data = agg_melt_p, aes(x = cat, y = value)) + 
       geom_line(aes(colour = variable))

ggplot(data = agg_melt_p, aes(x = cat, y=value)) +  
      geom_line(aes(group = variable))

answered Jan 18, 2018 at 18:11

Eric Fail

8,0188 gold badges76 silver badges136 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Sajal Roychowdhury Over a year ago

This works for me ! Thanks ! Also can you tell how to scale the values I am using ? I am appending this line chart with a 100% Stacked bar chart with the same X axis as Category .

Eric Fail Over a year ago

Glad it works for you. Please ask any new questions an a new question.

Collectives™ on Stack Overflow

Multiple Line charts in R using ggplot2 package

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related