view first 5 row and column

head(mtcars)
##                    mpg cyl disp  hp drat    wt  qsec vs am gear carb
## Mazda RX4         21.0   6  160 110 3.90 2.620 16.46  0  1    4    4
## Mazda RX4 Wag     21.0   6  160 110 3.90 2.875 17.02  0  1    4    4
## Datsun 710        22.8   4  108  93 3.85 2.320 18.61  1  1    4    1
## Hornet 4 Drive    21.4   6  258 110 3.08 3.215 19.44  1  0    3    1
## Hornet Sportabout 18.7   8  360 175 3.15 3.440 17.02  0  0    3    2
## Valiant           18.1   6  225 105 2.76 3.460 20.22  1  0    3    1

variable’s name

##  [1] "mpg"  "cyl"  "disp" "hp"   "drat" "wt"   "qsec" "vs"   "am"   "gear"
## [11] "carb"
library(ggplot2)
library(ggthemes)
## Warning: package 'ggthemes' was built under R version 3.4.4
ggplot(mtcars,aes(x=wt,y=qsec,fill=wt))+geom_point()+ theme_minimal()

ggplot(mtcars) + geom_point(aes(x = wt, y = mpg,
     colour = factor(gear))) + facet_wrap(~am)+ theme_dark()

ggplot(mpg, aes(displ, hwy, colour = class)) + 
  geom_point()+ theme_economist()