将二维矩阵转换为向量并在R中进行索引

Question

I have a matrix as follows:

> td
  doc_id        d_name
1      1    John Smith
2      3  Casey Newton
3      5 Ricardo Adams
4      6  Jonah Jensen

I want to convert into a name vector which is indexed by its id:

> df
John Smith  Casey Newton Ricardo Adams  Jonah Jensen 
        1             3             5             6 

Is there a way this is possible? Or may be a more efficient approach?

Answer 1

Yes. The simplest solution is:

a= td[,1]
names(a) = td[,2]