R: Examples for 'tidyr::expand

### ** Examples

expand_grid(x = 1:3, y = 1:2)

# A tibble: 6 × 2
      x     y
  <int> <int>
1     1     1
2     1     2
3     2     1
4     2     2
5     3     1
6     3     2

expand_grid(l1 = letters, l2 = LETTERS)

# A tibble: 676 × 2
   l1    l2   
   <chr> <chr>
 1 a     A    
 2 a     B    
 3 a     C    
 4 a     D    
 5 a     E    
 6 a     F    
 7 a     G    
 8 a     H    
 9 a     I    
10 a     J    
# … with 666 more rows

# Can also expand data frames
expand_grid(df = data.frame(x = 1:2, y = c(2, 1)), z = 1:3)

# A tibble: 6 × 2
   df$x    $y     z
  <int> <dbl> <int>
1     1     2     1
2     1     2     2
3     1     2     3
4     2     1     1
5     2     1     2
6     2     1     3

# And matrices
expand_grid(x1 = matrix(1:4, nrow = 2), x2 = matrix(5:8, nrow = 2))

# A tibble: 4 × 2
  x1[,1]  [,2] x2[,1]  [,2]
   <int> <int>  <int> <int>
1      1     3      5     7
2      1     3      6     8
3      2     4      5     7
4      2     4      6     8

Examples for 'tidyr::expand_grid'

Create a tibble from all combinations of inputs