Flashcards in Math Deck (18)

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1

## sin,cos,tan,asin,acos,atan,atan2,log,log10,exp max(x) min(x) sum(x) mean(x) median(x) rank(x) var(x) sd(x) cor(x) var(x, y) cor(x, y)

### simple math functions

2

## range(x)

### id. then c(min(x), max(x))

3

## diff(x)

### lagged and iterated differences of vector x

4

## prod(x)

### product of the elements of x

5

## quantile(x,probs=)

###
sample quantiles corresponding to the given prob-

abilities (defaults to 0,.25,.5,.75,1)

6

## weighted.mean(x, w)

### mean of x with weights w

7

## round(x, n)

### round(x, n)

8

## log(x, base)

### computes the logarithm of x with base base

9

## scale(x)

###
if x is a matrix, centers and reduces the data; to center only use

the option center=FALSE, to reduce only scale=FALSE (by default

center=TRUE, scale=TRUE)

10

## pmin(x,y,...)

###
a vector which ith element is the minimum of x[i],

y[i], . . .

11

## pmax(x,y,...)

### d. for the maximum

12

## cumsum(x)

### a vector which ith element is the sum from x[1] to x[i]

13

## cumprod(x)

### d. for the product

14

## cummin(x)

### id. for the minimum

15

## cummax(x)

### d. for the maximum

16

##
union(x,y), intersect(x,y), setdiff(x,y), setequal(x,y),

is.element(el,set)

### “set” functions

17

## Mod(x)

### modulus; abs(x) is the same

18