错误：“条件长度 > 1，仅使用第一个元素”

Question

我的目标是根据每个测量径流水平（“ q347_2035")，这里是 283 个测量值的向量。所以例如如果 q347_2035 大于 60 且小于/等于 160，则最小径流计算为 q347_2035 的一部分（参见下面的代码）：

getQMIN <- if(q347_2035 <= 60){
  qMin_2035 = 50
} else if (q347_2035>60 & q347_2035 <= 160) {
  qMin_2035 = 50 + (8/10)*(q347_2035 - 60)
} else if (q347_2035>=160 & q347_2035 <= 500) {
  qMin_2035 = 130 + (4.4/10)*(q347_2035 - 160)
} else if (q347_2035>=500 & q347_2035 <= 2500) {
  qMin_2035 = 280 + (31/100)*(q347_2035 - 500)
} else if (q347_2035>=2500 & q347_2035 < 10000) {
  qMin_2035 = 900 + (21.3/100)*(q347_2035 - 2500)
} else if (q347_2035>=10000 & q347_2035 < 60000) {
  qMin_2035 = 2500 + (150/1000)*(q347_2035 - 10000)
} else {
  qMin_2035 = 10000
}

现在我总是收到错误消息，说：

Warning messages:
1: In if (q347_2035 <= 60) { :
  the condition has length > 1 and only the first element will be used
2: In if (q347_2035 > 60 & q347_2035 <= 160) { :
  the condition has length > 1 and only the first element will be used
3: In if (q347_2035 >= 160 & q347_2035 <= 500) { :
  the condition has length > 1 and only the first element will be used
4: In if (q347_2035 >= 500 & q347_2035 <= 2500) { :
  the condition has length > 1 and only the first element will be used

谁能帮忙解决这个问题？ 提前非常感谢！

Answer 1

尝试在您的语句中使用 && 而不是 &。有关原因的进一步解释，请查看此帖子的答案：Boolean operators && and ||。

q347_2035 = 60

getQMIN <- if(q347_2035 <= 60){
qMin_2035 = 50
} else if (q347_2035>60 && q347_2035 <= 160) {
qMin_2035 = 50 + (8/10)*(q347_2035 - 60)
} else if (q347_2035>=160 && q347_2035 <= 500) {
qMin_2035 = 130 + (4.4/10)*(q347_2035 - 160)
} else if (q347_2035>=500 && q347_2035 <= 2500) {
qMin_2035 = 280 + (31/100)*(q347_2035 - 500)
} else if (q347_2035>=2500 && q347_2035 < 10000) {
qMin_2035 = 900 + (21.3/100)*(q347_2035 - 2500)
} else if (q347_2035>=10000 && q347_2035 < 60000) {
qMin_2035 = 2500 + (150/1000)*(q347_2035 - 10000)
} else {
qMin_2035 = 10000
}

getQMIN #Result is 50