v<-floor(runif(10)*10)
n.row<-3
n.col<-4
m<-matrix(floor(runif(n.row*n.col)*10),n.row,n.col)
arr.dim<-c(2,3,4)
a<-array(floor(runif(prod(arr.dim))*10),arr.dim)
v
m
a
> v
[1] 8 3 5 6 4 7 3 6 2 8
> m
[,1] [,2] [,3] [,4]
[1,] 5 6 1 7
[2,] 9 2 2 0
[3,] 1 3 6 3
> a
, , 1
[,1] [,2] [,3]
[1,] 7 2 5
[2,] 8 4 3
, , 2
[,1] [,2] [,3]
[1,] 8 5 2
[2,] 8 1 5
, , 3
[,1] [,2] [,3]
[1,] 9 7 7
[2,] 2 0 8
, , 4
[,1] [,2] [,3]
[1,] 3 0 5
[2,] 3 4 8
v%*%v
v%o%v
> v%*%v
[,1]
[1,] 312
> v%o%v
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] 64 24 40 48 32 56 24 48 16 64
[2,] 24 9 15 18 12 21 9 18 6 24
[3,] 40 15 25 30 20 35 15 30 10 40
[4,] 48 18 30 36 24 42 18 36 12 48
[5,] 32 12 20 24 16 28 12 24 8 32
[6,] 56 21 35 42 28 49 21 42 14 56
[7,] 24 9 15 18 12 21 9 18 6 24
[8,] 48 18 30 36 24 42 18 36 12 48
[9,] 16 6 10 12 8 14 6 12 4 16
[10,] 64 24 40 48 32 56 24 48 16 64
> m
[,1] [,2] [,3] [,4]
[1,] 5 6 1 7
[2,] 9 2 2 0
[3,] 1 3 6 3
> t(m)
[,1] [,2] [,3]
[1,] 5 9 1
[2,] 6 2 3
[3,] 1 2 6
[4,] 7 0 3
- 正方行列、上三角行列、下三角行列、対角成分、対角行列
n.row<-3
n.col<-3
m2<-matrix(floor(runif(n.row*n.col)*10),n.row,n.col)
m3<-m2
m3[!upper.tri(m3)]<-0
m3
m3<-m2
m3[!lower.tri(m3)]<-0
m3
m3<-m2
diag(m3)
diag(diag(m3))
m4<-solve(m2)
m4%*%m2
m2%*%m4
e.out<-eigen(m2)
e.out
v<-e.out[[2]]
s<-diag(e.out[[1]])
v%*%s%*%solve(v)
m2
> n.row<-3
> n.col<-3
> m2<-matrix(floor(runif(n.row*n.col)*10),n.row,n.col)
> m3<-m2
> m3[!upper.tri(m3)]<-0
> m3
[,1] [,2] [,3]
[1,] 0 6 2
[2,] 0 0 2
[3,] 0 0 0
> m3<-m2
> m3[!lower.tri(m3)]<-0
> m3
[,1] [,2] [,3]
[1,] 0 0 0
[2,] 6 0 0
[3,] 1 5 0
> m3<-m2
> diag(m3)
[1] 5 9 6
> diag(diag(m3))
[,1] [,2] [,3]
[1,] 5 0 0
[2,] 0 9 0
[3,] 0 0 6
>
> m4<-solve(m2)
>
> m4%*%m2
[,1] [,2] [,3]
[1,] 1.000000e+00 -1.540434e-15 -3.608225e-16
[2,] 4.024558e-16 1.000000e+00 1.942890e-16
[3,] 0.000000e+00 -4.440892e-16 1.000000e+00
> m2%*%m4
[,1] [,2] [,3]
[1,] 1.000000e+00 -6.661338e-16 0.000000e+00
[2,] -2.220446e-16 1.000000e+00 5.551115e-17
[3,] 1.110223e-16 0.000000e+00 1.000000e+00
>
> e.out<-eigen(m2)
> e.out
$values
[1] 14.7877109 4.3001970 0.9120921
$vectors
[,1] [,2] [,3]
[1,] -0.5299298 -0.07540878 -0.6546323
[2,] -0.7097543 -0.30740064 0.5995079
[3,] -0.4641370 0.94858756 -0.4604854
>
> v<-e.out[[2]]
> s<-diag(e.out[[1]])
>
> v%*%s%*%t(v)
[,1] [,2] [,3]
[1,] 4.568092 5.303678 3.604534
[2,] 5.303678 8.183490 3.365697
[3,] 3.604534 3.365697 7.248417
> m2
[,1] [,2] [,3]
[1,] 5 6 2
[2,] 6 9 2
[3,] 1 5 6
> v%*%s%*%solve(v)
[,1] [,2] [,3]
[1,] 5 6 2
[2,] 6 9 2
[3,] 1 5 6
> m2
[,1] [,2] [,3]
[1,] 5 6 2
[2,] 6 9 2
[3,] 1 5 6