Copyright | (C) 2012-2015 Edward Kmett |
---|---|

License | BSD-style (see the file LICENSE) |

Maintainer | Edward Kmett <ekmett@gmail.com> |

Stability | experimental |

Portability | non-portable |

Safe Haskell | Trustworthy |

Language | Haskell98 |

Free metric spaces

# Documentation

class Additive f => Metric f where Source #

Free and sparse inner product/metric spaces.

dot :: Num a => f a -> f a -> a Source #

Compute the inner product of two vectors or (equivalently)
convert a vector `f a`

into a covector `f a -> a`

.

`>>>`

11`V2 1 2 `dot` V2 3 4`

dot :: (Foldable f, Num a) => f a -> f a -> a Source #

Compute the inner product of two vectors or (equivalently)
convert a vector `f a`

into a covector `f a -> a`

.

`>>>`

11`V2 1 2 `dot` V2 3 4`

quadrance :: Num a => f a -> a Source #

Compute the squared norm. The name quadrance arises from Norman J. Wildberger's rational trigonometry.

qd :: Num a => f a -> f a -> a Source #

Compute the quadrance of the difference

distance :: Floating a => f a -> f a -> a Source #

Compute the distance between two vectors in a metric space

norm :: Floating a => f a -> a Source #

Compute the norm of a vector in a metric space

signorm :: Floating a => f a -> f a Source #

Convert a non-zero vector to unit vector.

## Instances

project :: (Metric v, Fractional a) => v a -> v a -> v a Source #

`project u v`

computes the projection of `v`

onto `u`

.