ndarray-distance

Lp distance between ndarrays

Last updated 6 years ago by
jaspervdg .

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$ cnpm install ndarray-distance

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Computes the Lp distance between two ndarrays. Works both in node.js and in browserify.

```
var distance = require("ndarray-distance")
var ndarray = require("ndarray")
//Create two arrays
var a = ndarray([1, 2, 3, 4, 5])
var b = ndarray([0, 2, 3, 10, 6])
//First compute sum of squared distances
var l2Dist = distance(a, b)
//Can also compute l1 distance (absolute difference)
var l1Dist = distance(a, b, 1)
//And maximum distance
var linfDist = distance(a, b, Infinity)
//And any other Lp distance as well
var l3Dist = distance(a, b, 3)
```

Install using npm:

```
npm install ndarray-distance
```

`require("ndarray-distance")(a, b[, p])`

Computes the Lp distance between two ndarrays `a`

and `b`

. That is,

```
dist(a,b,p) = ( sum |a[i] - b[i]|^p )^(1/p)
```

Note that here `a`

and `b`

do not have to be vectors and can be images or volumes.

`a`

and`b`

are both ndarrays with the same shape`p`

is a parameter that determines the exponent of the metric. The default value is`p=2`

Special values of `p`

include:

`p=0`

which counts the number of entries where`a`

and`b`

differ`p=1`

which is the absolute difference between`a`

and`b`

`p=2`

which is the ordinary Euclidean sum of squared differences`p=Infinity`

which is the maximum absolute difference between`a`

and`b`

**Returns** The Lp distance between `a`

and `b`

(c) 2014 Mikola Lysenko. MIT License

- 1.0.0 ... latest (6 years ago)

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Dependencies (1)

- cwise ^1.0.7

Dev Dependencies (3)

- almost-equal ^1.0.0
- ndarray ^1.0.18
- tape ^4.0.0

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