Data Frame info

Define data

baseball <- data.frame(wins=c(15,14,11,10,4,9,0,6),homeruns=c(7,3,5,3,1,4,2,3))

what are the column names?

names(baseball)

## [1] "wins"     "homeruns"

what are the first 5 rows?

head(baseball,5)

##   wins homeruns
## 1   15        7
## 2   14        3
## 3   11        5
## 4   10        3
## 5    4        1

How many rows are there?

nrow(baseball)

## [1] 8

How many columns are there?

ncol(baseball)

## [1] 2

Better, what are the dimensions?

dim(baseball)

## [1] 8 2

More details, what is the structure?

str(baseball)

## 'data.frame':    8 obs. of  2 variables:
##  $ wins    : num  15 14 11 10 4 9 0 6
##  $ homeruns: num  7 3 5 3 1 4 2 3