#INSTRUCTIONS: type the commands in R studio - but do not #run them, first ask yourself and note down, what *do you #think* would R say? Only then run them in R studio. This is the #only way to learn simple commands - and have them #memorized so that you can write code without having to check #every single command. Also, use the Data101 laboratory site #and run the codes (always asking yourself FIRST, what #will R say?)
 
 
 #PRACTICE:
 
 
 SCORE=c(30,15,66);
 GRADE=c('C', 'F', 'A')
 ON_SMARTPHONE=c('always', 'never', 'sometimes')
 FINALEXAM=c(12,5,20)
 M=data.frame(SCORE, GRADE, ON_SMARTPHONE, FINALEXAM)
 M[FINALEXAM > 5,]
 #what would R say?