Popularity
5.1
Declining
Activity
0.0
Stable
9
4
1
Monthly Downloads: 26
Programming language: Haskell
License: GNU General Public License v3.0 only
Tags:
Math
mathexpr alternatives and similar packages
Based on the "Math" category.
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vector
An efficient implementation of Intindexed arrays (both mutable and immutable), with a powerful loop optimisation framework . 
hgeometry
HGeometry is a library for computing with geometric objects in Haskell. It defines basic geometric types and primitives, and it implements some geometric data structures and algorithms. The main two focusses are: (1) Strong type safety, and (2) implementations of geometric algorithms and data structures that have good asymptotic running time guarantees. 
dimensional
Dimensional library variant built on Data Kinds, Closed Type Families, TypeNats (GHC 7.8+). 
numhask
A haskell numeric prelude, providing a clean structure for numbers and operations that combine them. 
poly
Fast polynomial arithmetic in Haskell (dense and sparse, univariate and multivariate, usual and Laurent) 
eigen
Haskel binding for Eigen library. Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
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Do you think we are missing an alternative of mathexpr or a related project?
README
mathexpr
Ever wanted to take as input a mathematical expression to fill in values and use it? mathexpr
is exactly what you need.
I also wrote this in JavaScript some time ago: Equation
Examples
Simple evaluation of expressions:
import Data.MathExpr
main = do
expr < getLine  a mathematical expression, e.g. sin x + y ^ 2
 replace x and y with the specified values and evaluate: sin 2 + 5 ^ 2 = 25.909..
print $ evaluate def expr [("x", 2), ("y", 5)]
Using custom operators and functions:
import Data.MathExpr
 operators are in the form (character, precedence, function)
 example: ('+', 0, (+)), ('*', 1, (*))
 the function should have the type (Double > Double > Double)
 the higher the precedence, the sooner the operator operates
 functions are in the form (name, function)
 example: ("ln", log)
 the function should have the type (Double > Double)
main =
let avg a b = (a + b) / 2
let settings = Settings { operators = defaultOperators ++ [('~', 0, avg)]
, functions = defaultFunctions ++ [("trunc", fromIntegral . truncate)]
evaluate settings "3 ~ 5" []  4
evaluate settings "trunc 1.1" []  1