卷曲括号问题 - r-循环中的ifelse语句

Question

我有一个由于卷曲括号问题而无法工作的代码

o1 = read.table('/Users/manshi/Desktop/PSYC57H3/PSYC57_Homework3/Object1.csv', header=TRUE, sep=",")
PredictedValue = vector(mode = 'numeric', length = 100)
PredictionError = vector(mode = 'numeric', length = 100)
PredictedValue[1] = 0
AlAccepts = vector(mode = 'logical', length = 100)
for (trial in 1:100){
  ifelse (AlAccepts[trial] == FALSE, 0, 1) {
    PredictionError[trial] = o1$Reward[trial] - PredictedValue[trial]
    PredictedValue[trial + 1] = PredictedValue[trial] + .3*PredictionError[trial]
  } ifelse (AlAccepts[trial] == TRUE, 0, 1) {
PredictedValue[trial + 1] = PredictedValue[trial]
  }
}

我收到的错误消息是：

> for (trial in 1:100){
+   ifelse (AlAccepts[trial] == FALSE, 0, 1) {
Error: unexpected '{' in:
"for (trial in 1:100){
  ifelse (AlAccepts[trial] == FALSE, 0, 1) {"
>     PredictionError[trial] = o1$Reward[trial] - PredictedValue[trial]
>     PredictedValue[trial + 1] = PredictedValue[trial] + .3*PredictionError[trial]
>   }   ifelse (AlAccepts[trial] == TRUE, 0, 1) {
Error: unexpected '}' in "  }"
>     PredictedValue[trial + 1] = PredictedValue[trial]
>   }
Error: unexpected '}' in "  }"
> }
Error: unexpected '}' in "}"
> 

我在做什么错？

Answer 1

ifelse (AlAccepts[trial] == FALSE, 0, 1)是一个函数，并导致返回值，在这种情况下为0或1。使用else if(){}应按照预期工作：

for (trial in 1:100){
  if (AlAccepts[trial] == FALSE) {
    PredictionError[trial] = o1$Reward[trial] - PredictedValue[trial]
    PredictedValue[trial + 1] = PredictedValue[trial] + .3*PredictionError[trial]
  } else if(AlAccepts[trial] == TRUE) {
PredictedValue[trial + 1] = PredictedValue[trial]
  }
}