mathjs/docs/reference/functions/trace.md

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Function trace #

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

Syntax #

math.trace(x)

Parameters #

Parameter	Type	Description
x	Array | Matrix	A matrix

Returns #

Type	Description
number	The trace of x

Examples #

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

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

See also #

diag