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46 lines
653 B
Markdown
46 lines
653 B
Markdown
# Function trace
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Calculate the trace of a matrix: the sum of the elements on the main
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diagonal of a square matrix.
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## Syntax
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```js
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math.trace(x)
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```
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### Parameters
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Parameter | Type | Description
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--------- | ---- | -----------
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`x` | Array | Matrix | A matrix
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### Returns
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Type | Description
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---- | -----------
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Number | The trace of `x`
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## Examples
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```js
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math.trace([[1, 2], [3, 4]]); // returns 5
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var A = [
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[1, 2, 3],
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[-1, 2, 3],
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[2, 0, 3]
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]
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math.trace(A); // returns 6
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```
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## See also
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[diag](diag.md)
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