# ParserFunction: Utilities for parsing and evaluating mathematical expressions.

ParserFunction provides utilities for parsing and evaluating mathematical expressions.
The central parsing function in this package is `stringToExpr`

, which parses a string-expression
(e.g. "3*x+2") and returns a Maybe expression tree of type Expr (e.g. Just (Add (Mul (Num 3.0) (Var 'x')) (Num 2.0))).
This type is suitable for performing symbolic logic. Expressions can then be evaluated using the function `evaluate`

(e.g. `evaluate`

(fromAscList [("x",2)]) (Add (Mul (Num 3.0) (Var 'x'))) (Num 2.0) would give 8.0).
If you wish to evaluate a string-expression without any intermediate symbolic logic operations, simply use the function
`evaluateExpression`

(e.g. `evaluateExpression`

"3*x+2" [('x',4)] gives 14.0). More examples of these functions can be found
by viewing the source code for this package.

Versions [RSS] [faq] | 0.0.1, 0.0.2, 0.0.3, 0.0.4, 0.0.5, 0.0.6, 0.0.7, 0.0.8, 0.1.0 |
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Dependencies | base (<6), containers, parsec [details] |

License | BSD-3-Clause |

Author | Enzo Haussecker |

Maintainer | ehaussecker@gmail.com |

Category | Parsing |

Uploaded | by EnzoHaussecker at 2012-02-07T22:33:12Z |

Distributions | NixOS:0.1.0 |

Downloads | 7172 total (49 in the last 30 days) |

Rating | (no votes yet) [estimated by Bayesian average] |

Your Rating | |

Status | Docs uploaded by user Build status unknown [no reports yet] |

## Downloads

- ParserFunction-0.0.6.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)

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