Transform dataframe to binary dataframe in R

I have a dataframe such as

Groups Names
G1     SP1
G1     SP2
G1     SP3
G2     SP1
G2     SP4
G3     SP2
G3     SP1 

And I would like to transform it as :

  Names G1 G2 G3
  SP1   1  1  1
  SP2   1  0  1  
  SP3   1  0  0 
  SP4   0  1  0

Where in columns are the Groups
and within cell 1 = present and 0 = absent

Here is the dput format

structure(list(Groups = c("G1", "G1", "G1", "G2", "G2", "G3", 
"G3"), Names = c("SP1", "SP2", "SP3", "SP1", "SP4", "SP2", "SP1"
)), class = "data.frame", row.names = c(NA, -7L))

>Solution :

Use table:

table(df$Names, df$Groups)
     
      G1 G2 G3
  SP1  1  1  1
  SP2  1  0  1
  SP3  1  0  0
  SP4  0  1  0