mathjs/docs/reference/functions/dot.md

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif

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# Function dot

Calculate the dot product of two vectors. The dot product of
`A = [a1, a2, ..., an]` and `B = [b1, b2, ..., bn]` is defined as:

   dot(A, B) = conj(a1) * b1 + conj(a2) * b2 + ... + conj(an) * bn


## Syntax

```js
math.dot(x, y)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`x` | Array &#124; Matrix | First vector
`y` | Array &#124; Matrix | Second vector

### Returns

Type | Description
---- | -----------
number | Returns the dot product of `x` and `y`


## Examples

```js
math.dot([2, 4, 1], [2, 2, 3])       // returns number 15
math.multiply([2, 4, 1], [2, 2, 3])  // returns number 15
```


## See also

[multiply](multiply.md),
[cross](cross.md)