Function eval #

Evaluate an expression.

Note the evaluating arbitrary expressions may involve security risks, see http://mathjs.org/docs/expressions/security.html for more information.

Syntax #

math.eval(expr)
math.eval(expr, scope)
math.eval([expr1, expr2, expr3, ...])
math.eval([expr1, expr2, expr3, ...], scope)

Parameters #

Parameter Type Description
expr string | string[] | Matrix The expression to be evaluated
scope Object Scope to read/write variables

Returns #

Type Description
* The result of the expression

Examples #

math.eval('(2+3)/4');                // 1.25
math.eval('sqrt(3^2 + 4^2)');        // 5
math.eval('sqrt(-4)');               // 2i
math.eval(['a=3', 'b=4', 'a*b']);,   // [3, 4, 12]

var scope = {a:3, b:4};
math.eval('a * b', scope);           // 12

See also #

parse, compile

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