# Equations

### From Torque OBD2 Wiki

The PID Editor contains a reasonably powerful equation editor that allows you to manipulate the incoming data from an OBD device, Sensor, or other data input to the app

## Functions that manipulate data

The equation editor supports the following functions

#### EWMAF(weight:value)

- Exponentially weighted moving average filter - filter noisy signals here. 'weight' should be between 0(more smoothing) and 1(less smoothing)

#### TAVG(seconds:value)

- Timed average. This averages the incoming data for the configured amount of time (in seconds). Data older than the configured time is removed from being averaged

#### RAVG(value)

- Rolling average. This averages incoming values until it is reset. No values are removed from the average until it is reset.

#### AVG(bucketSize:value)

- Point average. This averages incoming values from a bucket of s set size. The bucket can be configured to average a set amount of values, so AVG(10,value) would average the last 10 values

#### TDLY(seconds:value)

- Time based delay - causes data to be delayed by 'seconds' amount before being returned. Returns 0 until data buffer is full

#### RDLY(polls:value)

- Read based delay - data is delayed by X polling loops before being returned

#### TOT(seconds:value)

- Totalizer function based upon difference from time/value

#### SIN(value), COS(value) ,TAN(value)

- Trigonometric functions are supported

#### LOG(value)

- Returns the natural logarithm (base e) of a value

#### LOG10(value)

- Returns the base 10 logarithm of a value

#### LOG1P(value)

- Returns the natural logarithm of the sum of the value and 1

#### INT(value)

- Converts the incoming number to an integer

#### SQRT(value)

- Returns the correctly rounded positive square root of a value.

#### ABS(value)

- Returns the absolute value of the number given

#### SIGNED(value)

- Treats the incoming value as 8bit signed

## Functions that generate or retrieve data

#### RANDOM()

- Returns a random number between 0 and 1

#### BARO()

- Returns the barometric pressure from the android device or measured from the vehicle ECU if it supports it in psi