仅使用x轴上的列和y轴上的整列中的某些行值来创建图

Question

I have a dataset of 2 variables and over 30k observations. one variable is country and the other is price. I want to plot the countries on the x axis but I only want to include certain rows(countries) such as "UK" & "USA" and not all the 20 countries listed in the column.

I am using ggplot but I am not sure how I would subset the dataset to include only those countries and their prices.

one_plot <- subset(origin_price$product_origin == c["USA", "UK", "Australia", "China"])

I tried to subset using the above code which is wrong, but Im struggling to find any solutions online to this particular problem.

Answer 1

y = sample(1:1000,1000) #price
x = sample(letters, 1000, replace = T) #country names

library(ggplot2)
d = data.frame(x,y)
d = subset(d, x == "a"| x == "b")

Use subset to subset dataframe and | to separate the countries you want to plot.

u = ggplot(d, aes(x = x, y = y))
u + geom_point()  # that is it.