Go Mathematical Expression Toolkit
The Go Expression Toolkit (Go-ExprTk) is a wrapper library based on C++ Mathematical Expression Toolkit Library (ExprTk).
It is a simple to use, easy to integrate and extremely efficient run-time mathematical expression parser and evaluation engine.
Go-ExprTk supports numerous forms of functional, logical and vector processing semantics and is very easily extendible.
Installation
go get github.com/Pramod-Devireddy/go-exprtk
Examples
package main
import (
"fmt"
"github.com/Pramod-Devireddy/go-exprtk"
)
func main() {
exprtkObj := exprtk.NewExprtk()
defer exprtkObj.Delete()
exprtkObj.SetExpression("(x + 2)*(y-2)")
exprtkObj.AddDoubleVariable("x")
exprtkObj.AddDoubleVariable("y")
err := exprtkObj.CompileExpression()
if err != nil {
fmt.Println(err.Error())
return
}
exprtkObj.SetDoubleVariableValue("x", 18)
exprtkObj.SetDoubleVariableValue("y", 32)
fmt.Println(exprtkObj.GetEvaluatedValue())
}
Check out more Examples
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Features
The Go-ExprTk library has the following capabilities:
-
Mathematical operators (+, -, *, /, %, ^)
-
Functions (min, max, avg, sum, abs, ceil, floor, round, roundn, exp, log, log10, logn, pow, root, sqrt, clamp, inrange, swap)
-
Trigonometry (sin, cos, tan, acos, asin, atan, atan2, cosh, cot, csc, sec, sinh, tanh, d2r, r2d, d2g, g2d, hyp)
-
Equalities & Inequalities (=, ==, <>, !=, <, <=, >, >=)
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Assignment (:=, +=, -=, *=, /=, %=)
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Logical operators (and, nand, nor, not, or, xor, xnor, mand, mor)
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Control structures (if-then-else, ternary conditional, switch case, return-statement)
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Loop structures (while loop, for loop, repeat until loop, break, continue)
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Optimization of expressions (constant folding, strength reduction, operator coupling, special functions and dead code elimination)
-
String operations (equalities, inequalities, logical operators, concatenation and sub-ranges)
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Expression local variables, vectors and strings
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User defined variables, vectors, strings, constants and function support
-
Multivariate function composition
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Multiple sequence point and sub expression support
-
Numeric integration and differentiation
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Vector Processing: BLAS-L1 (axpy, axpby, axpb), all/any-true/false, count, rotate-left/right, shift-left/right, sort, nth_element, iota, sum, kahan-sum, dot-product, copy
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Credits
This module could not be possible without the ExprTk library by Arash Partow and the idea of creating the wrapper module by Narayana Rao G S
Published under MIT License
