Expression

Evaluates a math expression f(x) and outputs the result as a Float. The full JavaScript Math.* library is exposed, plus the common constants pi, e, tau.

Node

Interactive preview is available in the interactive reader.

Sockets

x (in): Float. The input variable the expression binds to (default 0).
value (out): Float. The evaluated result.

Parameters

Parameter details are listed in the interactive docs.

Recognised Identifiers

The expression parser exposes these names — everything else raises an invalid-param problem and the output falls back to 0:

x: The input variable — bound to the x socket value.
pi: Math.PI.
e: Math.E.
tau: 2 × Math.PI.
sin, cos, tan, asin, acos, atan, atan2: Math.* trigonometry. Angles are in radians.
sqrt, abs, floor, ceil, round, sign: Math.* scalar functions.
min, max, pow, log, exp: Math.* multi-arg functions.
+, -, *, /, %, **: Standard arithmetic. ** is exponentiation.

Examples

sin(x) — identity sine wave.
sin(x * tau / 10) * 5 — sine with 10-unit period, amplitude 5.
abs(sin(x)) * 0.8 + 0.2 — oscillate between 0.2 and 1.
pow(x, 2) / 100 — quadratic ramp.
max(0, x - 5) — soft ReLU / threshold.