[问题类型]:
程式咨询(我想用R 做某件事情，但是我不知道要怎么用R 写出来)
[软件熟悉度]:
请把以下不需要的部份删除
新手(没写过程式，R 是我的第一次)
[问题叙述]:
其实这是coursera course的作业三，想要读入资料后，先看州名和outcome
名符不符合，不符合显示error，符合则显示outcome最好的医院
[程式范例]:
best <- function(x, y){
z <- c("heart attack", "heart failure", "pneumonia")
##read oucome data
outcome <- read.csv(file="outcome-of-care-measures.csv", header=T)
outcome[,11] <- as.numeric(as.character(outcome[,11]))
## check if state and outcome are valid
if (! ("x" %in% outcome$State)){
print("Error in best(state, outcome) : invalid state")
} else if (! ("y" %in% z)){
print("Error in best(state, outcome) : invalid state")
} else if ("y" == "heart attack"){
##return name with lowest 30 day death
outcome_select <- subset(outcome, outcome$State == "x")
outcome_sel_clean <-outcome_select[!is.na(outcome_select[,11]),] ##
remove NA
M_order <- order(outcome_sel_clean[,11]) ##establish order
outcome_sel_order <- outcome_sel_clean[M_order,] ## order as new order
result <- paste(outcome_sel_order[[1,2]], "heart attack", sep =",")
print(paste("best (", result, ")"))
}
接下来的程式码差不多，但是不管x输入哪个值，就算州名正确，也是跑出error…
因为从没学过程式语言，只是自已想自修，没想到这么难…
另一个是小弟的程式码确实可以再精简，不过就等更熟了…