how dcast a molten dataframe accross multiple dimentions?

Question

I am a bit confused on how to use dcast function even after reading the documentation. I am trying to dcast a molten dataframe as below

> head(res)
       factoroneid      factortwoid           val
1                1                1  5.8223670800
2                1                2 -1.3314644000
3                1                3  0.7206910120
4                1                4  0.0762039224
5                1                5  2.7409736300
6                1                6  0.0896606575

res contains 1st column and 2nd column as indices. I need to use 1st column data as row number and 2nd column data as column number and generate a matrix with value from 3rd column. I am trying something like this but the data doesn't look correct.

temp <- dcast(res, factoroneid + factortwoid ~ val)

expected output should be:

   1         2     3      4  ... 
1  5.82  -1.33  0.72  0.076  ...
2
3
4
.
.

Could you please suggest?

Answer 1

dcast(res, factoroneid ~ factortwoid)

Works for me.