当"warnings()"出现时，中断循环.出现在R中

问题描述

我遇到了一个问题: 我正在运行一个循环来处理多个文件.我的矩阵很大，因此如果我不小心的话，我经常会用光内存.

I am having an issue: I am running a loop to process multiple files. My matrices are enormous and therefore I often run out of memory if I am not careful.

如果创建了任何警告，是否有一种方法可以打破循环?它只是继续运行循环，并在以后报告失败了，这很烦人.任何想法哦，明智的stackoverflow-ers?！

Is there a way to break out of a loop if any warnings are created? It just keeps running the loop and reports that it failed much later... annoying. Any ideas oh wise stackoverflow-ers?!

推荐答案

您可以使用以下方法将警告变为错误:

You can turn warnings into errors with:

options(warn=2)

与警告不同，错误将中断循环.很好，R还会向您报告这些特定的错误是从警告中转换而来的.

Unlike warnings, errors will interrupt the loop. Nicely, R will also report to you that these particular errors were converted from warnings.

j <- function() {
    for (i in 1:3) {
        cat(i, "\n")
        as.numeric(c("1", "NA"))
}}

# warn = 0 (default) -- warnings as warnings!
j()
# 1 
# 2 
# 3 
# Warning messages:
# 1: NAs introduced by coercion 
# 2: NAs introduced by coercion 
# 3: NAs introduced by coercion 

# warn = 2 -- warnings as errors
options(warn=2)
j()
# 1 
# Error: (converted from warning) NAs introduced by coercion

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