b=matrix(c(5,6,7,8),nrow=2,ncol=2,byrow=T) ；a%*%b
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> b=matrix(c(5,6,7,8),nrow=2,ncol=2,byrow=T)
> a
[,1] [,2]
[1,] 1 2
[2,] 3 4
> b
[,1] [,2]
[1,] 5 6
[2,] 7 8
> a+b
[,1] [,2]
[1,] 6 8
[2,] 10 12
> a*b
[,1] [,2]
[1,] 5 12
[2,] 21 32
> a%*%b
[,1] [,2]
[1,] 19 22
[2,] 43 50
> t(a)
[,1] [,2]
[1,] 1 3
[2,] 2 4
> 1*5+2*7
[1] 19
> 1*6+2*8
[1] 22
> 3*5+4*7
[1] 43
> 3*6+4*8
[1] 50
>
> a
[,1] [,2]
[1,] 1 2
[2,] 3 4
> b
[,1] [,2]
[1,] 5 6
[2,] 7 8
> a+b
[,1] [,2]
[1,] 6 8
[2,] 10 12
> a*b
[,1] [,2]
[1,] 5 12
[2,] 21 32
> a%*%b
[,1] [,2]
[1,] 19 22
[2,] 43 50
> t(a)
[,1] [,2]
[1,] 1 3
[2,] 2 4
> 1*5+2*7
[1] 19
> 1*6+2*8
[1] 22
> 3*5+4*7
[1] 43
> 3*6+4*8
[1] 50
>
0 0
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