1.3 KiB
1.3 KiB
Function parse
Parse an expression. Returns a node tree, which can be evaluated by invoking node.evaluate().
Note the evaluating arbitrary expressions may involve security risks, see https://mathjs.org/docs/expressions/security.html for more information.
Syntax
math.parse(expr)
math.parse(expr, options)
math.parse([expr1, expr2, expr3, ...])
math.parse([expr1, expr2, expr3, ...], options)
Parameters
Parameter | Type | Description |
---|---|---|
expr |
string | string[] | Matrix | Expression to be parsed |
options |
{nodes: Object<string, Node>} | Available options: - nodes a set of custom nodes |
Returns
Type | Description |
---|---|
Node | Node[] | node |
Examples
const node1 = math.parse('sqrt(3^2 + 4^2)')
node1.compile().evaluate() // 5
let scope = {a:3, b:4}
const node2 = math.parse('a * b') // 12
const code2 = node2.compile()
code2.evaluate(scope) // 12
scope.a = 5
code2.evaluate(scope) // 20
const nodes = math.parse(['a = 3', 'b = 4', 'a * b'])
nodes[2].compile().evaluate() // 12