tryCatch似乎没有返回我的变量 [英] tryCatch does not seem to return my variable

问题描述

我试图使用tryCatch生成一个p值的列表，矩阵中有几行没有足够的t检验观察结果。这是我迄今为止生成的代码：

I'm trying to use tryCatch to generate a list of p-values there are several rows in the matrix that don't have enough observations for a t test. Here is the code I generated so far:

pValues <- c()
for(i in row.names(collapsed.gs.raw)){
  tryCatch({
    t <- t.test(as.numeric(collapsed.gs.raw[i,]) ~ group)
    pValues <- c(pValues, t$p.value)
  },
  error = function(err) {
    pValues <- c(pValues, "NA")
    message("Error")
    return(pValues)
  })}

它肯定会抛出一个错误[我放入消息（错误）行确认]。问题是矢量pValues没有任何NA，虽然它应该。

It definitely throws an error [I put in the message("Error") line to confirm]. The problem is that the vector pValues doesn't have any "NA" in it, though it should.

提前感谢您的帮助！

推荐答案

您的函数中的 pvalues 是一个局部变量。您可能可以用< < - 来解决这个问题，但最好让函数只返回一个所需的值，并将其收集到函数外部， code> sapply 。可能是（未经测试）：

The pvalues in your function is a local variable. You might be able to fix this with <<-, but it would be preferred to have the function just return the one desired value and collect them outside the function with sapply. Perhaps something like (untested):

pValues <- sapply(rownames(collapsed.gs.raw), function(i) {
  tryCatch({
    t.test(as.numeric(collapsed.gs.raw[i,]) ~ group)$p.value
  },
  error = function(err) {
    message("Error")
    return(NA)
  })
})

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