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45 lines
813 B
Markdown
45 lines
813 B
Markdown
<!-- Note: This file is automatically generated from source code comments. Changes made in this file will be overridden. -->
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# Function usolve
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Solves the linear equation system by backward substitution. Matrix must be an upper triangular matrix.
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`U * x = b`
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## Syntax
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```js
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math.usolve(U, b);
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```
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### Parameters
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Parameter | Type | Description
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--------- | ---- | -----------
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`U` | Matrix, Array | A N x N matrix or array (U)
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`b` | Matrix, Array | A column vector with the b values
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### Returns
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Type | Description
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---- | -----------
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DenseMatrix | Array | A column vector with the linear system solution (x)
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## Examples
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```js
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var a = [[-2, 3], [2, 1]];
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var b = [11, 9];
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var x = usolve(a, b); // [[8], [9]]
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```
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## See also
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[lup](lup.md),
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[slu](slu.md),
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[usolve](usolve.md),
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[lusolve](lusolve.md)
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