从向量中删除NA值 [英] Remove NA values from a vector

问题描述

我有一个巨大的向量，它具有几个NA值，并且我试图在该向量中找到最大值(向量是所有数字)，但是由于NA值.

I have a huge vector which has a couple of NA values, and I'm trying to find the max value in that vector (the vector is all numbers), but I can't do this because of the NA values.

如何删除NA值，以便可以计算最大值?

How can I remove the NA values so that I can compute the max?

推荐答案

尝试?max时，您会看到它实际上有一个na.rm =参数，默认情况下设置为FALSE. (这是许多其他R函数的常见默认值，包括sum()，mean()等)

Trying ?max, you'll see that it actually has a na.rm = argument, set by default to FALSE. (That's the common default for many other R functions, including sum(), mean(), etc.)

设置na.rm=TRUE可以满足您的要求:

Setting na.rm=TRUE does just what you're asking for:

d <- c(1, 100, NA, 10)
max(d, na.rm=TRUE)

如果确实要删除所有NA，请改用以下惯用法:

If you do want to remove all of the NAs, use this idiom instead:

d <- d[!is.na(d)]

最后的注释:其他函数(例如table()，lm()和sort())具有与NA相关的参数，这些参数使用不同的名称(并提供不同的选项).因此，如果NA导致您在函数调用中遇到问题，则值得检查函数参数中的内置解决方案.我发现已经有一个通常了.

A final note: Other functions (e.g. table(), lm(), and sort()) have NA-related arguments that use different names (and offer different options). So if NA's cause you problems in a function call, it's worth checking for a built-in solution among the function's arguments. I've found there's usually one already there.

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