不能 plot R 中数据的条形图

Question

I am new to R language and am performing analysis of a certain dataset.

Below is a dataframe that I have.

I want to plot something like this in R (Given below bar graph). I know how to do it in python but being a beginner in R I have no idea how to do so. Thanks in advance!

Answer 1

One solution is to use the ggplot2 package

ggplot2 is part of the tidyverse family of packages, as are tidyr and dplyr which I also use in the example below.

The %>% (pipe) operator is imported from dplyr , and passes the output of one function into another function's first argument. In a nutshell, x %>% f(y) is equivalent to f(x,y) .

I can't guarantee this will work without a reproducible example, but I'll talk you through it so you get the steps.

require(ggplot2)
require(dplyr)
require(tidyr)

### Format the data ------------------------------------------------------

formattedData <- 
myData %>%
select(product_title, max_rating, min_rating) %>% #select only the columns we need
## Pivot longer takes us from this:

# |product_name | min_rating | max_rating|
# |"foo"        | 1          | 325       |

# to this:

# |product_name | name       | value     |
# |"foo"        |"min_rating"| 1         |
# |"foo"        |"max_rating"| 325       |

# That's the data format ggplot() needs to do its stuff
pivot_longer(cols = all_of(c("max_rating", "min_rating"))) 

### Plot the data -------------------------------------------------------

ggplot(formattedData, # The data is our new 'formattedData' object
# aesthetics - X axis is product_title, y axis is value, # bar colour is name
       aes(x = product_title, y = value, fill = name)) + 
geom_bar(stat = "identity", position = "dodge") + # using the values, rather than counting elements
scale_fill_manual(values = c("max_rating" = "orange", "min_rating" = "blue") +  # custom colours
ggtitle("Top products ratings") + 
ylab("Ratings")