在 R 编程中将表达式转换为字符串 - deparse()函数

R 语言中的deparse()函数用于将表达式类的对象转换为字符类的对象。

Syntax: deparse(expr)

Parameters:
expr: Object of expression class

示例 1：

# R program to convert 
# expression to character
  
# Creating an object of expression class
x <- expression(sin(pi / 2))
  
# Class of object
class(x)
  
# Calling deparse() Function
x1 <- deparse(x)
  
# Class of parsed object
class(x1)

输出：

[1] "expression"
[1] "character"

示例 2：

# R program to convert 
# expression to character
  
# Creating an object of expression class
x <- expression(2 ^ 3)
  
# Evaluating the value of object
eval(x)
  
# Calling deparse() Function
x1 <- deparse(x)
  
# Evaluating the value of object
eval(x1)

输出：

[1] 8
[1] "expression(2^3)"