unexpected symbolunexpected end of input

Posted 2021-09-18 Data+Science+Insight

unexpected symbol、unexpected end of input

问题：

# 不是一个合法的表达式（expression）

parse(text = "2^")

parse(text = "2a")                
# Unexpected symbol

解决：

parse(text = "2^2") 

parse(text = "2*a")

完整错误：

Error in parse(text = "2a"): <text>:1:2: unexpected symbol
1: 2a
     ^
Traceback:

1. parse(text = "2a")

Error in parse(text = "2^"): <text>:2:0: unexpected end of input
1: 2^
   ^
Traceback:

1. parse(text = "2^")

参考：parse, deparse & expression Functions in R | Handle Character String & Expression

参考：statisticsglobe.com

参考：R