花括号问题 - 的R - 内for循环

Question

我有一个失败，因为花括号的工作守则ifelse声明发出

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] 
    } 
} 

，我得到的错误信息是：

> 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)

在一个返回值的函数，并且结果，在这种情况下为0或1。此外空调excecution不这样做以下括号示出了语法错误。使用else if(){}应该按照您的意图工作：

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] 
    } 
}