要运行此函数,可以在https://github.com/Bheal/Board-Q-A处找到csv文件care-measures-csv。 这篇文章只关注下面我功能的循环中使用的这部分代码:如果语句不会为for循环的每次迭代重置
if(num=="best"){num=1}
if(num=="worst") {num=nrow(df); print(num)}
我已经把这个功能在一起。我有一个想法(新手,我)做什么,但几乎每一步都需要调整一些东西以获得所需的功能。 但我剩下的一个障碍是,我似乎无法添加一个元素到我的循环,以便if-statment将新值赋给变量num
(如果num =“worst”是函数输入)。 (见下文# ***
)
rankall <- function(outcome, num = "best") {
## Read outcome data
tmp <- read.csv("outcome-of-care-measures.csv",na.strings="Not Available")
b1 <- outcome %in% c("heart attack","heart failure","pneumonia")
# if(){stop()}
if(b1==FALSE){ stop("Invaled output name")}
if(outcome=="heart attack") {i=11}
if(outcome=="heart failure") {i=17}
if(outcome=="pneumonia") {i=23}
t1<-as.vector(unique(tmp[['State']]))
#initialize a df for storage
dfall<- data.frame("H.name"=as.character(), "S.name"=as.character(), stringsAsFactors = FALSE)
for(x in 1:length(t1)) { # begin a loop, each state abb.
df <- subset(tmp, State==t1[x], select= c(2,i)) # subset data.frame, for state abb., & select column with Hospital name & i(outcome col).
df <- subset(df, !is.na(df[2])) # remove rows with na's in the outcome col from this data.frame.
# *** *** ***
print(dim(df)) # *** for each loop the dim(df) function is reset, but I can't get the num below in the to reset using the if statement.
# *** However if
if(num=="best"){num=1}
if(num=="worst") {num=nrow(df); print(num)} # *** this only prints one time, and is equal to the no. of rows in df from the first loop.
# *** *** ***
df <- df[order(df[2],df[1]), ] # order this data.frame. by outcome(primary) and Hosptial(secondary).
df[[1]] <- as.character(df[[1]]) # Class of First column of df changed: was class factor, changed to class char.
entry <- c(df[num,1],t1[x])
dfall <- rbind(dfall,entry, stringsAsFactors = FALSE) # ? I have to use stringsAsFactors=FALSE, else dfall won't populate properly.
}
names(dfall) <- c("Hospital", "State") # ? If I don not assign these names, d.f. dfall has wrong names(tied to 1st entry), not H.name,S.name.
return(dfall)
}
我对num
作品的依赖,如果它在函数调用等于一个整数,但在num
情况下=“最差”我需要拉每个迭代一个特定编号的条目。 (如果num
=“最好”不会影响结果,因为它对应于每次迭代中的第一行)。 为什么if语句不会受for循环的每次迭代影响? DF是被在每个循环复位和dim(df)
变化太大如下
if(num=="best"){num=1}
if(num=="worst") {num=nrow(df); print(num)}
证明的print(dim(df))
输出作为输出端看到的第二行给出打印91(然后NUM = 91用来在剩余的环如果在函数调用中num =“最差”)
> rankall("pneumonia", "worst")
[1] 91 2
[1] 91
[1] 14 2
[1] 65 2
[1] 73 2
.
.
.
.
Hospital State
1 JACKSONVILLE MEDICAL CENTER AL
2 <NA> AK
3 <NA> AZ
4 <NA> AR
5 MARINA DEL REY HOSPITAL CA
6 <NA> CO
.
.
.
在此先感谢。
我会建议调整排序'if(num ==“worst”)''而不是试图抓住一个数字位置。 'df < - df [order(df [2],df [1],decrease = T),]' – Nate
对不起,我不重复,但为了重申我的问题,等同于在所述data.frame的最后一行的函数调用中最差,并且希望在for循环中使用if语句来这样做。 – Bhail
这是因为你覆盖了'num'。在第一次迭代中,例如'num =“worst”',并且用一个数字替换它。在第二次迭代中,'num'是一个值,因此没有您的条件匹配 – ekstroem