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R語言 sweep()用法及代碼示例


R語言中的sweep()函數用於對數據矩陣中的行或列應用“+或-”操作。它用於掃描來自 data-framework 的值。

用法: 
sweep(x, MARGIN, STATS, FUN)
參數: 
x: Typically a matrix. 
MARGIN: MARGIN = 1 means row; MARGIN = 2 means column. 
STATS: the value that should be added or subtracted 
FUN: The operation that has to be done (e.g. + or -) 

示例 1:掃描矩陣

Python3


# R program to illustrate
# sweep matrix
 
# Create example matrix
data <- matrix(0, nrow = 6, ncol = 4)          
 
# Apply sweep in R
data_ex1 <- sweep(x = data, MARGIN = 1, STATS = 5, FUN = "+") 
 
# Print example 1
print(data_ex1) 
                              

輸出:



     [,1] [,2] [,3] [,4]
[1,]    5    5    5    5
[2,]    5    5    5    5
[3,]    5    5    5    5
[4,]    5    5    5    5
[5,]    5    5    5    5
[6,]    5    5    5    5

在上麵的代碼中,矩陣的值為0,然後被sweep()函數掃描,矩陣的新值變為5。

示例 2:將 sweep() 與 stats 一起使用

Python3


# R program to illustrate
# sweep function with stats
 
# Create example matrix
data <- matrix(0, nrow = 6, ncol = 4)          
 
# Sweep with Complex STATS
data_ex2 <- sweep(x = data, MARGIN = 1,                      
                  STATS = c(1, 2, 3, 4, 5, 6), FUN = "+")
 
# Print example 2
print(data_ex2)                                                      

輸出:

     [,1] [,2] [,3] [,4]
[1,]    1    1    1    1
[2,]    2    2    2    2
[3,]    3    3    3    3
[4,]    4    4    4    4
[5,]    5    5    5    5
[6,]    6    6    6    6

在上麵的例子中,我們使用了 sweep() 函數和統計信息。




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注:本文由純淨天空篩選整理自akhilsharma870大神的英文原創作品 Changing row and column values of a Matrix in R Language – sweep() 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。