如何在ggplot中为X轴使用特定值的堆积条形图？

Question

I have been looking into many tutorials about this without success so far. I have this simple dataset.

TestCases     Column-1  Column-2 
TestCase-1        2       5     
TestCase-2        3       8
TestCase-3        4       7
TestCase-4        5       9
TestCase-5        2       7

I need to make, in ggplot, a stacked histogram combining the values of Column-1 and Column-2 and having in the X axis the names of the TestCases column, eg, TestCase-1, TestCase2, etc.

Answer 1

You need to reshape your data first with tidyr::gather , then you can plot with ggplot .

df <- read.table(header = TRUE, text = "
  TestCases     Column-1  Column-2 
  TestCase-1        2       5     
  TestCase-2        3       8
  TestCase-3        4       7
  TestCase-4        5       9
  TestCase-5        2       7")

df2 <- tidyr::gather(df, key = "Column", value = "Values", -TestCases)
ggplot(df2, aes(x = TestCases, y = Values, fill = Column)) +
  geom_bar(stat = "Identity")