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R語言 data.matrix()用法及代碼示例


data.matrix()R語言中的函數用於通過將數據幀的所有值轉換為數字模式然後將它們綁定為矩陣來創建矩陣。

用法: data.matrix(df)

參數:
df:要轉換的數據幀。

範例1:


# R program to convert a data frame
# into a numeric matrix
    
# Creating a dataframe 
df1 = data.frame( 
  "Name" = c("Amar", "Akbar", "Ronald"), 
  "Language" = c("R", "Python", "C#"), 
  "Age" = c(26, 38, 22) 
) 
  
# Printing data frame
print(df1)
  
# Converting into numeric matrix
df2 <- data.matrix(df1)
df2

輸出:

    Name Language Age
1   Amar        R  26
2  Akbar   Python  38
3 Ronald       C#  22
     Name Language Age
[1, ]    2        3  26
[2, ]    1        2  38
[3, ]    3        1  22

範例2:


# R program to convert a data frame
# into a numeric matrix
    
# Creating a dataframe 
df <- data.frame(sample(LETTERS[1:4], 8, 
                 replace = T), cbind(1:4, 1:8))
colnames(df) <- c("x", "y", "z")
  
# Printing data frame
print(df)
  
# Converting into numeric matrix
df2 <- data.matrix(df)
df2

輸出:

  x y z
1 A 1 1
2 D 2 2
3 C 3 3
4 A 4 4
5 B 1 5
6 B 2 6
7 A 3 7
8 C 4 8
     x y z
[1, ] 1 1 1
[2, ] 4 2 2
[3, ] 3 3 3
[4, ] 1 4 4
[5, ] 2 1 5
[6, ] 2 2 6
[7, ] 1 3 7
[8, ] 3 4 8



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注:本文由純淨天空篩選整理自nidhi_biet大神的英文原創作品 Convert a Data Frame into a Numeric Matrix in R Programming – data.matrix() Function。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。