R study Notes "five" R Language Beginner's Guide--Chapter Two summary

The second chapter learns the R function:

1 sum calculation and sum (x,na.rm=true) calculated in Vector x, which excludes NA elements

2 Median calculates the median to return the number of the middle of a sample data median (x,na.rm=true)

3 Max COMPUTE Max Max (x,na.rm=true)

4 min Compute min min (x,na.rm=true)

5 c () Connect data connection data to form a vector. C (a)

6 Cbind data cbind with column variables (x, y, z)

7 Rbind data rbind with row variables (x, y, z)

8 vectors in vector form with data vector (length=10)

9 matrix combined with data matrices (nrow=10,ncol=4)

Data.frame data Data.frame (X=X,Y=Y,Z=Z) with data frame

A list of data lists (X=X,Y=Y,Z=Z)

Rep cyclic data or Variable rep (c (each=10),

SEQ generates an ordered sequence seq (1,10)

Dim the dimensionality of the computed matrix or cbind-combined data Dim (MyData)

Colnames get the column name of the matrix or cbind combination of data colnames (MyData)

Rownames get the row name of a matrix or cbind-bound data rownames (MyData)

SETWD set working directory SETWD ("E:/r/r-beginer-guide/mycode")

Read.table reading data from an ASCII file read.table (file= "test.txt", Header=true)

Scan ("Test.txt") when reading data from an ASCII file (Big data is fast)

R study Notes "five" R Language Beginner's Guide--Chapter Two summary