#câu 1:
library(ggplot2)
# Sử dụng dữ liệu iris có sẵn
data(iris)
# Tính độ lệch chuẩn theo Species
sd_sepal <- aggregate(Sepal.Length ~ Species,
data = iris,
FUN = sd)
print(sd_sepal)
## Species Sepal.Length
## 1 setosa 0.3524897
## 2 versicolor 0.5161711
## 3 virginica 0.6358796
# Cài và nạp thư viện ggplot2
install.packages("ggplot2")
## Warning: package 'ggplot2' is in use and will not be installed
# Vẽ biểu đồ violin
ggplot(iris, aes(x = Species, y = Petal.Width, fill = Species)) +
geom_violin() +
labs(title = "Violin plot of Petal.Width by Species",
x = "Species",
y = "Petal.Width") +
theme_minimal()
#câu 2:
import pandas as pd
# đọc dữ liệliệu
df = pd.read_csv("iris.csv")
# lọc các dòng có sepal.width < 3.0
filtered_df = df[df["sepal.width"] < 3.0]
#xuất kết quả ra file
filtered_df.to_csv("filtered_width.csv", index=False)
print(filtered_df)
## sepal.length sepal.width petal.length petal.width variety
## 8 4.4 2.9 1.4 0.2 Setosa
## 41 4.5 2.3 1.3 0.3 Setosa
## 53 5.5 2.3 4.0 1.3 Versicolor
## 54 6.5 2.8 4.6 1.5 Versicolor
## 55 5.7 2.8 4.5 1.3 Versicolor
## 57 4.9 2.4 3.3 1.0 Versicolor
## 58 6.6 2.9 4.6 1.3 Versicolor
## 59 5.2 2.7 3.9 1.4 Versicolor
## 60 5.0 2.0 3.5 1.0 Versicolor
## 62 6.0 2.2 4.0 1.0 Versicolor
## 63 6.1 2.9 4.7 1.4 Versicolor
## 64 5.6 2.9 3.6 1.3 Versicolor
## 67 5.8 2.7 4.1 1.0 Versicolor
## 68 6.2 2.2 4.5 1.5 Versicolor
## 69 5.6 2.5 3.9 1.1 Versicolor
## 71 6.1 2.8 4.0 1.3 Versicolor
## 72 6.3 2.5 4.9 1.5 Versicolor
## 73 6.1 2.8 4.7 1.2 Versicolor
## 74 6.4 2.9 4.3 1.3 Versicolor
## 76 6.8 2.8 4.8 1.4 Versicolor
## 78 6.0 2.9 4.5 1.5 Versicolor
## 79 5.7 2.6 3.5 1.0 Versicolor
## 80 5.5 2.4 3.8 1.1 Versicolor
## 81 5.5 2.4 3.7 1.0 Versicolor
## 82 5.8 2.7 3.9 1.2 Versicolor
## 83 6.0 2.7 5.1 1.6 Versicolor
## 87 6.3 2.3 4.4 1.3 Versicolor
## 89 5.5 2.5 4.0 1.3 Versicolor
## 90 5.5 2.6 4.4 1.2 Versicolor
## 92 5.8 2.6 4.0 1.2 Versicolor
## 93 5.0 2.3 3.3 1.0 Versicolor
## 94 5.6 2.7 4.2 1.3 Versicolor
## 96 5.7 2.9 4.2 1.3 Versicolor
## 97 6.2 2.9 4.3 1.3 Versicolor
## 98 5.1 2.5 3.0 1.1 Versicolor
## 99 5.7 2.8 4.1 1.3 Versicolor
## 101 5.8 2.7 5.1 1.9 Virginica
## 103 6.3 2.9 5.6 1.8 Virginica
## 106 4.9 2.5 4.5 1.7 Virginica
## 107 7.3 2.9 6.3 1.8 Virginica
## 108 6.7 2.5 5.8 1.8 Virginica
## 111 6.4 2.7 5.3 1.9 Virginica
## 113 5.7 2.5 5.0 2.0 Virginica
## 114 5.8 2.8 5.1 2.4 Virginica
## 118 7.7 2.6 6.9 2.3 Virginica
## 119 6.0 2.2 5.0 1.5 Virginica
## 121 5.6 2.8 4.9 2.0 Virginica
## 122 7.7 2.8 6.7 2.0 Virginica
## 123 6.3 2.7 4.9 1.8 Virginica
## 126 6.2 2.8 4.8 1.8 Virginica
## 128 6.4 2.8 5.6 2.1 Virginica
## 130 7.4 2.8 6.1 1.9 Virginica
## 132 6.4 2.8 5.6 2.2 Virginica
## 133 6.3 2.8 5.1 1.5 Virginica
## 134 6.1 2.6 5.6 1.4 Virginica
## 142 5.8 2.7 5.1 1.9 Virginica
## 146 6.3 2.5 5.0 1.9 Virginica