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How to use the parse function from mathjs

Find comprehensive JavaScript mathjs.parse code examples handpicked from public code repositorys.

mathjs.parse is a method in the mathjs library that parses a mathematical expression string into a tree of nodes that represent the expression's structure.

quantum-circuit.js

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if(this.params.length) {
	pyquil += "\n";
	for(var i = 0; i < this.params.length; i++) {
		var globalParamName = this.params[i];

		var node = math.parse(globalParams[globalParamName]);
		var globalParamValue = node.toString({ handler: mathToStringHandler });

		pyquil += globalParamName + " = " + globalParamValue + "\n";
	}

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+ 3633 other calls in file

XMLRenderer.tsx

GitHub: ExpeditionRPG/expedition

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const visible = (text.match(INITIAL_OP_WITH_PARAGRAPH) || [])[1];
let paragraph = `<p>${sanitizeStyles(text)}</p>`;
if (visible) {
  // Parse AST for expression and check if outermost node/operation is of type "OperatorNode" (e.g. == >= != etc.)
  // Used to try to be smarter about whether a MathJS evaluation should be output or an if attribute
  const visibleTree = Math.parse(visible);
  if (visibleTree.type === 'OperatorNode') {
    text = text.replace('{{' + visible + '}}', '');
    paragraph = `<p if="${escapeXml(visible)}">${sanitizeStyles(text)}</p>`;
  }

+ 9 other calls in file

How does mathjs.parse work?

mathjs.parse is a function in the Math.js library that takes a string as input and parses it into a Math.js expression tree, which can then be evaluated to obtain a numerical result or transformed in various ways. The parser recognizes a wide variety of mathematical expressions, including arithmetic operations, functions, variables, constants, matrices, and more.

mjs-play.js

GitHub: pie-framework/pie-lib

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  percent,
});


// const r = v => mathjs.rationalize(v);
// const a = mathjs.parse('4 x');
// const b = mathjs.parse('x 4');


const mo = (tree) => JSON.stringify(tree, null, '  ');
// // console.log('a:', mo(a));
// // console.log('b:', mo(b));

+ 23 other calls in file

mathjs-helper.js

GitHub: trebor/algebranch

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function equivalent(nodeA, nodeB) {
  return nodeA.toString() == nodeB.toString();
}

function parseExpression(expressionText) {
  return math.parse(expressionText); //.transform(compressExpression);
}

function compressExpression(node, path, parent) {
  return NODE.parenthesis.is(node) ? node.content : node;

Ai Example

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const math = require("mathjs");

const expression = "3 * x + 2";
const node = math.parse(expression);

console.log(node.toString());

In this example, we are parsing the mathematical expression "3 * x + 2" using mathjs.parse(), which returns an Abstract Syntax Tree (AST) representation of the expression. We then print out the AST using the toString() method.

calculations.ts

GitHub: viktorstrate/latex-equation-toolbox

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  latex = latex.replace('=', '+') // Used to parse equations
  parsedMath = new AlgebraLatex().parseLatex(latex)
  parsedMath = parsedMath.toMath()
  console.log(parsedMath)

  parsedMath = math.parse(parsedMath)
} catch (e) {
  return []
}

+ 3 other calls in file

index.js

GitHub: jly36963/notes

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// Parse
// ---

const basicParse = () => {
  // parse
  const node = math.parse('sqrt(x/x+1)')
  node.toString() // returns 'sqrt((x / x) + 1)'
  node.toTex() // returns '\sqrt{ {\frac{x}{x} }+{1} }'

  // parser

+ 2 other calls in file

GE.js

GitHub: jmmcd/GEjs

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console.log("fitness", ind[3]);
console.log("phenotype", ind[1]);
var s = ind[1];
s = replaceAll(s, "x0", "x") // for human readers now
s = replaceAll(s, ".*", "*");
const node = math.parse(s);
console.log("latex", node.toTex());
console.log("simplified", math.simplify(s).toString())
   }

+ 2 other calls in file

index.js

GitHub: google/mathsteps

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const stepThrough = require('./stepThrough');

function factorString(expressionString, debug=false) {
  let node;
  try {
    node = math.parse(expressionString);
  }
  catch (err) {
    return [];
  }

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index.js

GitHub: hellomouse/Tachyon-Calculator

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const DERIVATIVE_H = 1e-15;
const SMALL_NUMBER = math.bignumber('1e-15');
const OPTIMIZATION_INTERMEDIATE_RATIO = 0.3819660112501051517954;

const compileFuncFromString = (func, variable) => {
    let temp = math.parse(func).compile();
    return x => {
        let scope = {};
        if (typeof variable === 'string')
            scope[variable] = x;

+ 13 other calls in file

README.md?plain=1

GitHub: robz/mathjs

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// provide a scope
var scope = {
    x: 3,
    a: 2
};
var node2 = math.parse('x^a', scope);
node2.eval(); // 9

// change a value in the scope and re-evaluate the node
scope.a = 3;

+ 11 other calls in file

calculator.js

GitHub: gravaman/fleish

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  number: 'BigNumber',
  precision: 64
})

const pvCode = math.parse('fv * e^-(r * t)').compile()
const pvdxCode = math.parse('-fv * t * e^-(r*t)').compile()
const pvmCode = math.parse('c*(1 + y/k)^-(k*t)').compile()
const couponPmtCode = math.parse('t * r / m * p').compile()
const newtRootCode = math.parse('x0 - y / dy').compile()
const stableCode = math.parse('abs(x1 - x0) <= theta').compile()

+ 17 other calls in file

newton.js

GitHub: JaimeGrimaldo/Matematicas_ing_programas

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if (xInicial == "") {
  xInicial = sinValorInicial(funcion);
}
iteracion = 0;
xn = xInicial;
f = parse(funcion);
const simplified = simplify(f);
fPrima = parse(derivarFuncion(funcion));
const simplifiedPrima = simplify(fPrima);
bandera = true;

+ 2 other calls in file

falsa.js

GitHub: JaimeGrimaldo/Matematicas_ing_programas

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xu = 0;
bandera = true;
max = 0;
min = 0;
valorInicial = 0;
const f = parse(funcion);
const simplified = simplify(f);

while (bandera) {
  resultadoFuncion = simplified.evaluate({ x: valorInicial });

calculate.js

GitHub: azorekb/AzorBot

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texts[1] = texts[1].replace(/∓/g, '+');
text = '';
for(let i = 0; i < 2; i++)
{
    text += (i + 1) + ': ';
    const node = math.parse(texts[i]);
    const calculation = math.evaluate(node.toString());
    if(calculation == Infinity){text += '<a:FA_Sparkles:977507221166518322> **INFINITY** <a:FA_Sparkles:977507221166518322>';}
    else{text += calculation.toString();}
    text += '\n';

+ 1215 other calls in file

Other functions in mathjs

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mathjs.evaluate is the most popular function in mathjs (87200 examples)

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