R tapply()

1 개요

R tapply()

R

CPU

2.7s

MEM

124M

4.5s

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df <- read.table("https://raw.githubusercontent.com/shifteight/R/master/TRB/data/daphnia.txt", header=T)
head(df)

A data.frame: 6 × 4

	Growth.rate	Water	Detergent	Daphnia
	<dbl>	<chr>	<chr>	<chr>
1	2.919086	Tyne	BrandA	Clone1
2	2.492904	Tyne	BrandA	Clone1
3	3.021804	Tyne	BrandA	Clone1
4	2.350874	Tyne	BrandA	Clone2
5	3.148174	Tyne	BrandA	Clone2
6	4.423853	Tyne	BrandA	Clone2

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attach(df)
tapply(Growth.rate, Detergent, mean)

BrandA

3.88483213877778

BrandB

4.01004411644444

BrandC

3.95451226927778

BrandD

3.55823108644444

2 같이 보기

• R by()
• R apply()
• R lapply()
• R sapply()
• R mapply()
• R ddply()
• R aggregate()
• R apply 패밀리

3 참고

• https://www.rdocumentation.org/packages/base/versions/3.6.0/topics/tapply