CODEWITHSUNDEEP
rggplot2
LeelaSella
LeelaSella

Reputation: 817

connecting points

I have the following plot

require(ggplot2)

dtf <- structure(list(Variance = c(5.213, 1.377, 0.858, 0.613, 0.412, 0.229, 0.139, 0.094, 0.064), Component = structure(1:9, .Label = c("PC1", "PC2", "PC3", "PC4", "PC5", "PC6", "PC7", "PC8", "PC9"), class = "factor")), .Names = c("Variance", "Component"), row.names = c(NA, -9L), class = "data.frame")

ggplot(dtf, aes(x = Component, y = Variance)) +
geom_point()

enter image description here

I would simply like to connect the dots with straight lines. I tried +geom_line() but that generated an error

Upvotes: 8

Views: 20947

Answers (2)

IRTFM
IRTFM

Reputation: 263471

This would plot the points with x as the integer values of the factor categories:

 ggplot(dtf, aes(x = as.numeric(Component), y = Variance)) +
      geom_point() + geom_line()

You can put back in the category labels with:

ggplot(dtf, aes(x = as.numeric(Component), y = Variance)) +
  geom_point() +geom_line() + scale_x_discrete(labels=dtf$Component)

Upvotes: 0

Didzis Elferts
Didzis Elferts

Reputation: 98579

Your x values are discrete (factor) and geom_line() each unique x value perceive as separate group and tries to connect points only inside this group. Setting group=1 in aes() ensures that all values are treated as one group.

ggplot(dtf, aes(x = Component, y = Variance,group=1)) +
  geom_point()+geom_line()

Upvotes: 27

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