矩陣與R中的向量相乘

Question

我有一個矩陣m和一個向量v。我想乘以矩陣m爲vetcor v並得到一個矩陣與m相同的尺寸意味着將第一個元素m乘以v和....我怎樣才能做到這一點在R？

m = matrix(c(1, 2, 3, 4, 5), ncol=1) 
    v = c(1, 2, 3, 4, 5) 
    > z 
     [,1] 
[1,] 1 
[2,] 4 
[3,] 9 
[4,] 16 
[5,] 25 

Answer 1

Cross products可以使用%*%運營商獲得：

> m = matrix(c(1, 2, 3, 4, 5), ncol=1) 
>  v = c(1, 2, 3, 4, 5) 

> m %*% v 
    [,1] [,2] [,3] [,4] [,5] 
[1,] 1 2 3 4 5 
[2,] 2 4 6 8 10 
[3,] 3 6 9 12 15 
[4,] 4 8 12 16 20 
[5,] 5 10 15 20 25 
> m * v 
    [,1] 
[1,] 1 
[2,] 4 
[3,] 9 
[4,] 16 
[5,] 25