Comparison Operators
Comparison operators: ==, !=, <, >, <=, >=
1==1
## [1] TRUE
Logical operators: AND: &, OR: |, NOT: !
x <- 1:10; y <- 10:1
x > y & x > 5
## [1] FALSE FALSE FALSE FALSE FALSE TRUE TRUE TRUE TRUE TRUE
Basic Calculations
To look up math functions, see Function Index here
x + y
## [1] 11 11 11 11 11 11 11 11 11 11
sum(x)
## [1] 55
mean(x)
## [1] 5.5
apply(iris[1:6,1:3], 1, mean)
## 1 2 3 4 5 6
## 3.333333 3.100000 3.066667 3.066667 3.333333 3.666667