我想使用 ggplot2 在单个图中执行多行

Question

I am working on a large data set with many rows and columns. The data here is showing is portion of it. I want to put all the values of column b to e against the variable a

I tried the melt function and looks like it doesn't work. Please help me to solve this one by using ggplot2 and if necessary for loop or appy function

enter image description here

Answer 1

You can use the function gather() (library tidyr ), that will regroup the column b to e together. Then, you can plot with ggplot() and split your graph with the function facet_grid() .

df %>% 
gather(2:5, key = myColumns, value = myValues) %>% 
ggplot(aes(x = a, y = myValues, color = myColumns)) + 
geom_line() + 
facet_grid(myColumns ~ .)