evaler alternatives and similar packages
Based on the "Science and Data Analysis" category.
Alternatively, view evaler alternatives based on common mentions on social networks and blogs.
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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 -
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gosl
Linear algebra, eigenvalues, FFT, Bessel, elliptic, orthogonal polys, geometry, NURBS, numerical quadrature, 3D transfinite interpolation, random numbers, Mersenne twister, probability distributions, optimisation, differential equations. -
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gonum/mat64
DISCONTINUED. The general purpose package for matrix computation. Package mat64 provides basic linear algebra operations for float64 matrices. -
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TextRank
:wink: :cyclone: :strawberry: TextRank implementation in Golang with extendable features (summarization, phrase extraction) and multithreading (goroutine). -
sparse
Sparse matrix formats for linear algebra supporting scientific and machine learning applications -
triangolatte
2D triangulation library. Allows translating lines and polygons (both based on points) to the language of GPUs. -
PiHex
PiHex Library, written in Go, generates a hexadecimal number sequence in the number Pi in the range from 0 to 10,000,000. -
GoStats
GoStats is a go library for math statistics mostly used in ML domains, it covers most of the statistical measures functions. -
mudlark-go
DISCONTINUED. A collection of packages providing (hopefully) useful code for use in software using Google's Go programming language.
InfluxDB - Purpose built for real-time analytics at any scale.
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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(2-1)
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 non-trivial. 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/evalercd $GOPATH/src/github.com/soniah/evalergit remote rename origin upstreamgit remote add origin [email protected]:<your-github-username>/evaler.gitgit checkout -b developmentgit 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 (BSD-3)
Links
[1] http://en.wikipedia.org/wiki/Shunting-yard_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.