diag

Syntax

diag(X)

Arguments

X is a numeric vector or a square matrix.

Details

  • If X is a vector, return a diagonal matrix.
  • If X is a square matrix, return a vector with the diagonal elements of the matrix.

Examples

diag(1..5);
#0 #1 #2 #3 #4
1 0 0 0 0
0 2 0 0 0
0 0 3 0 0
0 0 0 4 0
0 0 0 0 5 
m=1..4$2:2;
m;
#0 #1
1 3
2 4 
diag(m);
// output
[1,4]