如何收到有关循环/应用程序正在进行的进度的警报 [英] How to be alerted about the ongoing progress of a loop/lapply

问题描述

在R中，有时我想知道一个长的for loop或lapply正在进行的进度.

In R, I will sometimes have a long for loop or lapply that I want to know the ongoing progress of.

以下内容符合我想要的但不起作用:

Something like the following is in the spirit of what I want but doesn't work:

lapply(1:n,function(i) { print(i); MAIN COMPUTATIONS })

理想情况下，上面的代码会在lapply的每次新迭代开始时打印i.

Ideally the above would print i at the beginning of each new iteration of the lapply.

问题::我如何获得正在进行的进度更新，以更新我的lapply或for loop完成了多少次迭代?

QUESTION: How do I get ongoing progress updates of how many iterations my lapply or for loop has done?

推荐答案

听起来好像您在Windows上使用RGui.菜单之一中应该有一个选项，告诉它不要缓冲输出.或者，您可以在每次打印后致电flush.console.

It sounds like you're using RGui on Windows. There should be an option in one of the menus to tell it to not buffer the output. Alternatively you could call flush.console after every time you print.

lapply(1:1000, function(i){print(i); flush.console()})

请注意，这会使代码变慢一点.

Note that this will slow down the code a little bit.

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