Function trace

Calculate the trace of a matrix: the sum of the elements on the main diagonal of a square matrix.

Syntax

trace(x)

Parameters

Parameter Type Description
x Array | Matrix A matrix

Returns

Type Description
number The trace of x

Examples

trace([[1, 2], [3, 4]]); // returns 5

var A = [
  [1, 2, 3],
  [-1, 2, 3],
  [2, 0, 3]
]
trace(A); // returns 6

See also

diag