比较R中的两个对象是否相等？ [英] Compare if two objects in R are equal?

问题描述

如何检查两个物件，例如数据帧，在R中的值相等

How do I check if two objects, e.g. dataframes, are value equal in R?

通过值相等，我的意思是一个数据帧的每一列的每一行的值等于相应行的值， 。

By value equal, I mean the value of each row of each column of one dataframe is equal to the value of the corresponding row and column in the second dataframe.

推荐答案

不清楚测试两个数据帧是否为值相等以测试值是否相同，这里是具有相等值的两个不相同的数据帧的示例：

It is not clear what it means to test if two data frames are "value equal" but to test if the values are the same, here is an example of two non-identical dataframes with equal values:

a <- data.frame(x = 1:10)
b <- data.frame(y = 1:10)

要测试所有值是否相等：

To test if all values are equal:

all(a == b) # TRUE

b
$ b

To test if objects are identical (they are not, they have different column names):

identical(a,b) # FALSE: class, colnames, rownames must all match.

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