Shulou(Shulou.com)06/02 Report--

This article mainly explains "how to merge and append data in R language". The content of the explanation in this article is simple and clear, and it is easy to learn and understand. let's study and learn "how to merge and append data in R language".

The data merge operation involves the following issues:

Horizontal merger

1. Do you need to match fields?

1.1 match field merge

1.1.1 main field with the same name

1.1.2 different names for the main field

1.2 No matching field merging is required

Vertical merge: (the case is relatively simple, with the same number of column fields and the same name)

Because the vertical merger is relatively simple, this article also focuses on horizontal merger. According to the above problems, the functions that need to be used are listed as follows:

Cbind rbind merge plyr::join tidyr:: inner_join/full_join/left_join/right_join

Let's start by introducing two or three functions built into base:

Cbind rbind merge

# horizontal append (no matching fields are required)

The dataset is constructed as follows:

ID

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