evaler alternatives and similar packages
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gonum
Gonum is a set of numeric libraries for the Go programming language. It contains libraries for matrices, statistics, optimization, and more. 
gosl
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TextRank implementation in Golang with extendable features (summarization, weighting, phrase extraction) and multithreading (goroutine) support. 
sparse
Go Sparse matrix formats for linear algebra supporting scientific and machine learning applications, compatible with gonum matrix libraries. 
vectormath
Vectormath for Go, an adaptation of the scalar C functions from Sony's Vector Math library, as found in the Bullet2.79 source code. (currently inactive) 
triangolatte
2D triangulation library. Allows translating lines and polygons (both based on points) to the language of GPUs. 
ode
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GoStats
GoStats is an Open Source GoLang library for math statistics mostly used in Machine Learning domains, it covers most of the Statistical measures functions. 
mudlarkgo
A collection of packages providing (hopefully) useful code for use in software using Google's Go programming language.
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README
evaler
https://github.com/soniah/evaler
Package evaler implements a simple floating point arithmetic expression evaluator.
Evaler uses Dijkstra's Shunting Yard algorithm to convert an
infix expression to postfix/RPN format, then evaluates
the RPN expression. The implementation is adapted from a Java implementation. The results
are returned as a *big.Rat
.
Usage
result, err := evaler.Eval("1+2")
Operators
The operators supported are:
+  * / ^ ** () < > <= >= == !=
(^
and **
are both exponent operators)
Logical operators like <
(less than) or >
(greater than) get lowest precedence,
all other precedence is as expected 
BODMAS.
Logical tests like <
and >
tests will evaluate to 0.0 for false and 1.0
for true, allowing expressions like:
3 * (1 < 2) # returns 3.0
3 * (1 > 2) # returns 0.0
Minus implements both binary and unary operations.
See evaler_test.go
for more examples of using operators.
Trigonometric Operators
The trigonometric operators supported are:
sin, cos, tan, ln, arcsin, arccos, arctan
For example:
cos(1)
sin(21)
sin(1)+2**2
See evaler_test.go
for more examples of using trigonometric operators.
Variables
EvalWithVariables()
allows variables to be passed into expressions,
for example evaluate "x + 1"
, where x=5
.
See evaler_test.go
for more examples of using variables.
Issues
The math/big
library doesn't have an exponent function **
and implenting one
for big.Rat
numbers is nontrivial. As a work around, arguments are converted
to float64's, the calculation is done using the math.Pow()
function, the
result is converted to a big.Rat
and placed back on the stack.
 floating point numbers missing leading digits (like
".5 * 2"
) are failing  PR's welcome
Documentation
http://godoc.org/github.com/soniah/evaler
There are also a number of utility functions e.g. BigratToFloat()
,
BigratToInt()
that may be useful when working with evaler.
Contributions
Contributions are welcome.
If you've never contributed to a Go project before here is an example workflow.
 fork this repo on the GitHub webpage
go get github.com/soniah/evaler
cd $GOPATH/src/github.com/soniah/evaler
git remote rename origin upstream
git remote add origin [email protected]:<yourgithubusername>/evaler.git
git checkout b development
git push u origin development
(setup where you push to, check it works)
Author
Sonia Hamilton [email protected]
Dem Waffles [email protected]  trigonometric operators
License
Modified BSD License (BSD3)
Links
[1] http://en.wikipedia.org/wiki/Shuntingyard_algorithm
[2] http://en.wikipedia.org/wiki/Reverse_Polish_notation
*Note that all licence references and agreements mentioned in the evaler README section above
are relevant to that project's source code only.