Warning message: the condition has length ＞ 1 and only the first element will be used

Posted 2022-04-12 Data+Science+Insight

Warning message:In if (x > 1) :the condition has length > 1 and only the first element will be used

 

目录

Warning message:In if (x > 1) :the condition has length > 1 and only the first element will be used

问题：

解决:

完整问题：

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问题：

#想把向量中元素大于1的乘以2；

#如下方法把所有的元素都乘以了2

#define data
x <- c(2, 3, 1, 1, 5, 7)

#if value in vector x is greater than 1, multiply it by 2
if (x>1) 
  x*2


[1]  4  6  2  2 10 14

解决:

#使用ifelse语法

#if value in vector x is greater than 1, multiply it by 2
ifelse(x>1, x*2, x)

[1]  4  6  1  1 10 14

完整问题：

> #define data
> x <- c(2, 3, 1, 1, 5, 7)
> 
> #if value in vector x is greater than 1, multiply it by 2
> if (x>1)
+     x*2
+
[1]  4  6  2  2 10 14
Warning message:
In if (x > 1) :
  the condition has length > 1 and only the first element will be used

参考：R

参考：How to Fix in R: the condition has length > 1 and only the first element will be used