In-class activity #1

#addition
2-3

[1] -1

#division
2/3

[1] 0.6666667

#exponentiation
2^3

[1] 8

#sqaure root

#sqaure root
sqrt(2)

[1] 1.414214

#logarithms
log(2)

[1] 0.6931472

#Question_1: Compute the log base of 5 of 10 and the  of 10
log(5)

[1] 1.609438

log(10)

[1] 2.302585

log(2.72)

[1] 1.000632

Computing some offensice metrics in Baseball

#Batting Average = (No. of Hits)/(No. of At Bats)
#waht is the batting average of a player that bats 29 hits in 112 at bats?
BA=(29)/(112)
BA

[1] 0.2589286

Batting_Average=round(BA, digits = 3)
Batting_Average

[1] 0.259

#Question_2: What is the batting average of a player that bats 42 hits in 212 at bats?
Batting_Average_42=(42/212)
Batting_Average_42

[1] 0.1981132

#On Base Percentage
#OBP= (H+BB+HBP)/(At Bats+H+BB_HBP+SF)
#Let us compute the OBP for a player with the following general stats
#AB=515 , H=172, BB+84, HBP=%, SF = 6
OBP=(172+84+5)/(515+172+84+5+6)
OBP

[1] 0.3337596

On_Base_Percentage=round(OBP,digits=3)
On_Base_Percentage

[1] 0.334

#Question_3: Computer the OBP for a player with the following general stats:
#AB=565, H=156, BB=65, HBP=3, SF=7 
OBP=(156+65+3)/(565+156+65+3+7)
OBP

[1] 0.281407

Often you will want to test whether something is less than, greater than or equal to something.

3 ==8# does 3 equals 8?

[1] FALSE

3  !=8 #Is 3 differnt from 8?

[1] TRUE

3>4

[1] FALSE

The logical opertaors are & for logical AND | for logical OR and ! for NOT. These are some examples: