Math.js: Constants & Variables
Built-in Constants
Commonly used mathematical and logical constants are available:
| Constant | Description | Example |
|---|---|---|
pi, PI |
π ≈ 3.14159 | sin(pi/2) |
e, E |
Euler's number ≈ 2.71828 | log(e) |
i |
Imaginary unit, sqrt(-1) |
(2+3i)^2 |
Infinity |
Infinity | 1/0 |
NaN |
Not a Number | 0/0 |
true |
Boolean true | true or false |
false |
Boolean false | not true |
null |
Null value | null |
LN2 |
Returns the natural logarithm of 2. | 0.6931471805599453 |
LN10 |
Returns the natural logarithm of 10. | 2.302585092994046 |
LOG2E |
Returns the base-2 logarithm of E. | 1.4426950408889634 |
LOG10E |
Returns the base-10 logarithm of E. | 0.4342944819032518 |
phi |
The golden ratio defined as (1 + sqrt(5)) / 2 |
1.618033988749895 |
SQRT1_2 |
Returns the square root of 1/2. | 0.7071067811865476 |
SQRT2 |
Returns the square root of 2. | 1.4142135623730951 |
tau |
Ratio constant of a circle's circumference to radius 2 * pi. |
6.283185307179586 |
Variables
You can store and reuse values using variables.
- Assignment:
variableName = expression- Example:
x = 5 - Example:
y = x * 2 + 7
- Example:
- Assignments do not produce a result line in the output and do not update the
@(last answer) variable. - Variables are case-sensitive.
- Variables and their values are saved and persist between calculator sessions.