找到两个数据帧之间的数字重叠
[英]Find the number overlap between two data frames
问题描述
I have two data frames, one called gs and the other called mmpc . 
我有两个数据框，一个叫做gs ，另一个叫做mmpc 。 Each data frame has two columns, but a different number of rows. 每个数据框都有两列，但行数不同。 I am looking to find the number of rows that both data frames have in common. 我希望找到两个数据帧共有的行数 。 Does anyone know how to do this? 有谁知道如何做到这一点？
Note: the rows are not be in the same order between the two data frames, and the data frames have different numbers of rows. 注意：两个数据帧之间的行顺序不同，数据帧的行数不同。
2 个解决方案
解决方案1
2 2013-08-06 01:11:40
一种选择是使用merge ：
nrow(merge(gs,mmpc,by.x=1:2,by.y=1:2))
解决方案2
2 2013-08-06 01:28:40
其他方式：
sum(duplicated(rbind(gs, mmpc))[-seq_len(nrow(gs))])
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