x<-3
print(x)
y<-5
x+y
x-y
x*y
x/y
str(x)
>
> x<-3
>
> print(x)
[1] 3
> y<-5
>
> x+y
[1] 8
> x-y
[1] -2
> x*y
[1] 15
> x/y
[1] 0.6
>
> str(x)
num 3
v<-c(1,2,3)
print(v)
v2<-c(v,4)
print(v2)
v3<-c(v,v2)
print(v3)
> v<-c(1,2,3)
> print(v)
[1] 1 2 3
>
> v2<-c(v,4)
> print(v2)
[1] 1 2 3 4
>
> v3<-c(v,v2)
> print(v3)
[1] 1 2 3 1 2 3 4
u1<-1:5
print(u1)
u2<-rep(3,5)
print(u2)
u3<-rep(1:3,4)
print(u3)
u4<-seq(from=0,to=1,by=0.1)
print(u4)
u5<-seq(from=0,to=1,length=11)
print(u5)
u6<-runif(10)
print(u6)
str(u1)
> u1<-1:5
> print(u1)
[1] 1 2 3 4 5
> u2<-rep(3,5)
> print(u2)
[1] 3 3 3 3 3
> u3<-rep(1:3,4)
> print(u3)
[1] 1 2 3 1 2 3 1 2 3 1 2 3
> u4<-seq(from=0,to=1,by=0.1)
> print(u4)
[1] 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
> u5<-seq(from=0,to=1,length=11)
> print(u5)
[1] 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
> u6<-runif(10)
> print(u6)
[1] 0.6946362 0.3383167 0.8613114 0.9208206 0.8629161 0.5063075
[7] 0.4680532 0.9792969 0.2359983 0.8967567
> str(u1)
int [1:5] 1 2 3 4 5
u1<-1:3
u2<-5:3
print(u1)
print(u2)
u1+u2
u1-u2
u1*u2
u1/u2
> u1<-1:3
> u2<-5:3
> print(u1)
[1] 1 2 3
> print(u2)
[1] 5 4 3
>
> u1+u2
[1] 6 6 6
> u1-u2
[1] -4 -2 0
> u1*u2
[1] 5 8 9
> u1/u2
[1] 0.2 0.5 1.0
u1<-1:3
u2<-1:3
print(u1)
print(u2)
sum(u1*u2)
t(u1)%*%u2
u1%*%t(u2)
> u1<-1:3
> u2<-1:3
> print(u1)
[1] 1 2 3
> print(u2)
[1] 1 2 3
> sum(u1*u2)
[1] 14
> t(u1)%*%u2
[,1]
[1,] 14
m<-matrix(1:6,2,3)
print(m)
str(m)
> m<-matrix(1:6,2,3)
> print(m)
[,1] [,2] [,3]
[1,] 1 3 5
[2,] 2 4 6
> str(m)
int [1:2, 1:3] 1 2 3 4 5 6
dim(m)
> dim(m)
[1] 2 3
m2<-matrix(1:6,3,2)
print(m2)
m %*% m2
> m2<-matrix(1:6,3,2)
> print(m2)
[,1] [,2]
[1,] 1 4
[2,] 2 5
[3,] 3 6
> m %*% m2
[,1] [,2]
[1,] 22 49
[2,] 28 64
apply(m,1,sum)
apply(m,2,sum)
> apply(m,1,sum)
[1] 9 12
> apply(m,2,sum)
[1] 3 7 11
d<-c(2,3,4)
Nc<-prod(d)
print(Nc)
a<-array(1:Nc,d)
print(a)
>
> d<-c(2,3,4)
>
> Nc<-prod(d)
> print(Nc)
[1] 24
> a<-array(1:Nc,d)
> print(a)
, , 1
[,1] [,2] [,3]
[1,] 1 3 5
[2,] 2 4 6
, , 2
[,1] [,2] [,3]
[1,] 7 9 11
[2,] 8 10 12
, , 3
[,1] [,2] [,3]
[1,] 13 15 17
[2,] 14 16 18
, , 4
[,1] [,2] [,3]
[1,] 19 21 23
[2,] 20 22 24
dim(a)
apply(a,1,sum)
apply(a,2,sum)
apply(a,3,sum)
apply(a,c(1,2),sum)
apply(a,c(1,3),sum)
apply(a,c(2,3),sum)
apply(a,c(1,2,3),sum)
sum(a)
> dim(a)
[1] 2 3 4
>
> apply(a,1,sum)
[1] 144 156
> apply(a,2,sum)
[1] 84 100 116
> apply(a,3,sum)
[1] 21 57 93 129
> apply(a,c(1,2),sum)
[,1] [,2] [,3]
[1,] 40 48 56
[2,] 44 52 60
> apply(a,c(1,3),sum)
[,1] [,2] [,3] [,4]
[1,] 9 27 45 63
[2,] 12 30 48 66
> apply(a,c(2,3),sum)
[,1] [,2] [,3] [,4]
[1,] 3 15 27 39
[2,] 7 19 31 43
[3,] 11 23 35 47
> apply(a,c(1,2,3),sum)
, , 1
[,1] [,2] [,3]
[1,] 1 3 5
[2,] 2 4 6
, , 2
[,1] [,2] [,3]
[1,] 7 9 11
[2,] 8 10 12
, , 3
[,1] [,2] [,3]
[1,] 13 15 17
[2,] 14 16 18
, , 4
[,1] [,2] [,3]
[1,] 19 21 23
[2,] 20 22 24
> sum(a)
[1] 300