R combat: "Common functions" rnorm normal distribution _r

R Combat Series Column

Rnorm Normal distribution (the normal distribution) function

The function Rnorm of the whole distribution function is declared as follows:

Rnorm (n, mean = 0, SD = 1)

N: Produce random number of numbers

Mean: Expectation

SD: Is Variance

Produces 1000 random numbers, obeys the standard normal distribution

> rnorm (1000)
   [1] -1.236751e+00  3.366310e-02-1.118280e+00  2.248415e-01  1.036253e+00
   [6]- 4.981205e-01  1.417859e+00  7.423066e-01-1.649157e+00  4.752631e-02
  [one]  2.947828e-01- 1.693057e+00  3.417998e-01  8.506275e-01  2.413585e-01
  [1.205450e-01-1.098822e+00]  - 1.944444e-01  1.247038e+00-2.301569e+00
  [2.241360e-01]  1.447203e+00  1.045240e+00  8.210854e-01-1.949543e+00

Draw out these 1000 numbers

> x<-rnorm (1000)
> plot (seq (length (x)), X)

To draw a functional image of a standard global distribution

> X<-rnorm (3000) #生成3000个数字, conforms to the standard is too distributed
> Curve (dnorm (x), from=-5,to=5) #dnorm输入x求出其正太分布函数, curve draw the function interval [ -5,5] image on