58 lines
1.2 KiB
Markdown
58 lines
1.2 KiB
Markdown
<!-- Note: This file is automatically generated from source code comments. Changes made in this file will be overridden. -->
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# Function identity
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Create a 2-dimensional identity matrix with size m x n or n x n.
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The matrix has ones on the diagonal and zeros elsewhere.
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## Syntax
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```js
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math.identity(n)
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math.identity(n, format)
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math.identity(m, n)
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math.identity(m, n, format)
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math.identity([m, n])
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math.identity([m, n], format)
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```
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### Parameters
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Parameter | Type | Description
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--------- | ---- | -----------
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`size` | ...number | Matrix | Array | The size for the matrix
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`format` | string | The Matrix storage format
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### Returns
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Type | Description
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---- | -----------
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Matrix | Array | number | A matrix with ones on the diagonal.
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### Throws
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Type | Description
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---- | -----------
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## Examples
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```js
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math.identity(3) // returns [[1, 0, 0], [0, 1, 0], [0, 0, 1]]
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math.identity(3, 2) // returns [[1, 0], [0, 1], [0, 0]]
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const A = [[1, 2, 3], [4, 5, 6]]
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math.identity(math.size(A)) // returns [[1, 0, 0], [0, 1, 0]]
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```
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## See also
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[diag](diag.md),
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[ones](ones.md),
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[zeros](zeros.md),
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[size](size.md),
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[range](range.md)
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