I have a data frame, with 5 columns and 51 rows like the one below:
year | var1 | Var2 |
---|---|---|
1990 | 2.2 | 4.1 |
1991 | 2.3 | 4.4 |
I wanted to graph as many lines s are the columns to see the trend of each var over the years.
I tried with:
lt <- c("VAR2" = "twodash", "VAR3" = "dotted", "VAR4" = "dashed", "VAR5" = "solid")
ggp1 <- ggplot(DATAFRAME, aes(VAR1)) # Create ggplot2 plot
geom_line(aes(y = VAR2, linetype = "twodash", group=1, ))
geom_line(aes(y = VAR3, linetype = "dotted", group=1))
geom_line(aes(y = VAR4, linetype = "dashed", group=1))
geom_line(aes(y = VAR5, linetype = "solid", group=1))
labs(y = "number of parties in government", x= "year", lintype = "Legend")
scale_linetype_manual(values = lt)
ggp1
But it doesn't work. How can I do?
thank you all for the help.
CodePudding user response:
This should do it:
library(ggplot2)
DATAFRAME <- data.frame(
VAR1 = 1:20,
VAR2 = runif(20,0,1),
VAR3 = runif(20,1,2),
VAR4 = runif(20,2,3),
VAR5 = runif(20,3,4)
)
lt <- c("VAR2" = "twodash", "VAR3" = "dotted", "VAR4" = "dashed", "VAR5" = "solid")
ggplot(DATAFRAME, aes(VAR1)) # Create ggplot2 plot
geom_line(aes(y = VAR2, linetype = "VAR2", group=1, ))
geom_line(aes(y = VAR3, linetype = "VAR3", group=1))
geom_line(aes(y = VAR4, linetype = "VAR4", group=1))
geom_line(aes(y = VAR5, linetype = "VAR5", group=1))
labs(y = "number of parties in government", x= "year", lintype = "Legend")
scale_linetype_manual(values = unname(lt) )
The trick here is that when you create aesthetics this way (e.g., linetype = "VAR2"
or linetype = "twodash"
, ggplot2 will turn them into a factor and order the levels alphabetically. In your original code, the levels would be, in order, dashed, dotted, solid and twodash. What I did above was to put the levels in the intended order and then gave the vector of line-type values. Another catch is that ggplot
wants that vector to be un-named.
You could also specify breaks
in scale_linetype_manual
to set the levels of the factor that is created in the background. Then, your code would work as well.
ggplot(DATAFRAME, aes(VAR1)) # Create ggplot2 plot
geom_line(aes(y = VAR2, linetype = "twodash", group=1, ))
geom_line(aes(y = VAR3, linetype = "dotted", group=1))
geom_line(aes(y = VAR4, linetype = "dashed", group=1))
geom_line(aes(y = VAR5, linetype = "solid", group=1))
labs(y = "number of parties in government", x= "year", lintype = "Legend")
scale_linetype_manual(values = unname(lt), breaks=c("twodash", "dotted", "dashed", "solid"))
CodePudding user response:
you can also transpose the data with pivot_wider()
so you don't have to call geom_line
multiple times. You then can feed in the new variable with all of your variables to linetype as well.
library(ggplot2)
library(dplyr)
library(tidyr)
DATAFRAME <- data.frame(
VAR1 = 1:20,
VAR2 = runif(20,0,1),
VAR3 = runif(20,1,2),
VAR4 = runif(20,2,3),
VAR5 = runif(20,3,4)
)
#transpose to long format except your year variable
df2 <- pivot_longer(DATAFRAME, cols = paste0("VAR",2:5))
ggplot(df2)
geom_line(aes(x=VAR1 , y = value, group =name, linetype = name))
labs(y = "number of parties in government", x= "year", lintype = "Legend")