将向量中的每个元素本身相乘以创建矩阵

我试图将向量中的每个元素自身相乘，以使其产生一个围绕对角线对称的矩阵.例如，给定此向量:

I'm trying to multiply each element in a vector by itself such that it produces a matrix that is symmetric about the diagonal. For example, given this vector::

x <- 1:3

我想创建这个:

1 2 3  
2 4 6 
3 6 9  

即:

x[1]*x[1] x[2]*x[1] x[3]*x[1]  
x[1]*x[2] x[2]*x[2] x[3]*x[2] 
x[1]*x[3] x[2]*x[3] x[3]*x[3] 

任何帮助将不胜感激.谢谢.

Any help would be greatly appreciated. Thanks.