DataFrames in R

Data frames are data structure for most tabular data which we use for statistics in R. It has attributes rownames()which is used to annotate  the entity. Data frame is a special type of list where every element of a list has same length. Few additional built in function:-

·         data.matrix()

·         nrow(df) 

·         ncol(df)

·         cbind(df)

·         head()

·         tail()

·         Data frame is a special type of list where every element of a list has same length

# Empty

Command::  data.frame()

#Example

dFrame <- data.frame(id = letters[2:5], x = 2:5, y = rnorm(4))

 print(dFrame)

          id       x        y

1         b       2        0.3129572

2         c       3        1.6263950

3        d        4        0.8441991

4        e        5        1.0301756

cbind(dFrame, data.frame(z = 4))

  id x         y z

1  b 2 0.3129572 4

2  c 3 1.6263950 4

3  d 4 0.8441991 4

4  e 5 1.0301756 4

If we need to take header values

 head(dFrame,2)

          id       x         y

1        b        2        0.3129572

2        c        3        1.6263950

Footer values from frames

 tail(dFrame,2)

          id       x         y

3        d        4        0.8441991

4        e        5        1.0301756