Warning message:NAs introduced by coercion

问题：

解决：

完整问题：

问题：

#define character vector
x <- c('1', '2', '3', NA, '4', 'Hey')#convert to numeric vector
x_num <- as.numeric(x)#display numeric vector
x_num

解决：

#抑制警告信息的输出

#define character vector
x <- c('1', '2', '3', NA, '4', 'Hey')#convert to numeric vector, suppressing warnings
suppressWarnings(x_num <- as.numeric(x))#display numeric vector
x_num

#非数值元素用0来替换

#define character vector
x <- c('1', '2', '3', '4', 'Hey')#replace non-numeric values with 0
x <- gsub("Hey", "0", x)#convert to numeric vector
x_num <- as.numeric(x)#display numeric vector
x_num

完整问题：

> #define character vector
> x <- c('1', '2', '3', NA, '4', 'Hey')
>
> #convert to numeric vector
> x_num <- as.numeric(x)
Warning message:
NAs introduced by coercion
>
> #display numeric vector
> x_num
[1] 1 2 3 NA 4 NA
>

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Warning message:NAs introduced by coercion

Warning message:NAs introduced by coercion

问题：

解决：

完整问题：

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