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I am trying to plot two scatter lines in ggplot. The x axis is integers from 1 to 10. Initially I wrote the following code:

library(ggplot2) Answer <- c(1:10) EM = c(0.458,0.517,0.4,0.394,0.15,0.15,0.0,0.2,0.14,0.33) F1 = c( 0.56,0.63,0.632,0.704,0.502,0.524,0.488,0.64,0.5,0.593) test_data <- data.frame(EM,F1,Answer) ggplot(test_data, aes(Answer)) + geom_line(aes(y = EM, colour = "EM")) + geom_line(aes(y = F1, colour = "F1"))

This results in the following plot

enter image description here

The x axis is continuous here and printing values like 2.5,7.5. To make it factor ie 1,2,3,4,...,10 I tried putting aes(factor(Answer)) but this results in empty plot. How can I fix this?

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    In addition to the answers below, you may consider to reshape your data to long format, i.e., one column for all y values and a second column for the variables (EM, F1) which is preferred for efficiently working with ggplot2. This would also solve the issue that your y-axis is labelled EM now, although you show values of two variables. Commented Mar 21, 2017 at 8:55

1 Answer 1

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Keep your data continuous. If you want to change the scale, do just that:

ggplot(test_data, aes(Answer)) + geom_line(aes(y = EM, colour = "EM")) + geom_line(aes(y = F1, colour = "F1")) + scale_x_continuous(breaks = 1:10)

resulting plot

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