一、数据类型

1、数值

print(12345)
## [1] 12345

构造数值

连续整数值,如1:10;

1:20
##  [1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20

等差序列seq()

seq(1,5,0.5)
## [1] 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

随机整数值sample()

sample(1:100,5)
## [1] 15  6 48 67 71

随机的数值runif()

runif(10,1,10)
##  [1] 6.542385 3.994489 9.441024 1.269565 4.214209 8.651360 2.956042 6.365312
##  [9] 7.771159 9.329913

正态数值rnorm()

rnorm(10,1,10)
##  [1]   1.1322357  -4.2381887  -0.6856207  -4.5854899  -0.6102038   5.5250369
##  [7]   4.2700428  14.7406316 -12.1202087  -2.5088603

0,1数值rbinom()

rbinom(10,1,0.5)
##  [1] 1 0 0 1 1 0 0 0 0 1

数值计算

“+ - * /”

1+1
## [1] 2
2-1
## [1] 1
3*2
## [1] 6
6/3
## [1] 2

^2平方；sqrt 开方；%%求余；%/%取整；

2^2
## [1] 4
sqrt(4)
## [1] 2
5%%3
## [1] 2
5%/%3
## [1] 1

mean();sum();sd():var()

mean(1:10)
## [1] 5.5
sum(1:10)
## [1] 55
sd(1:10)
## [1] 3.02765