linedrive Reference

Scale numbers exponentially

linedrive

Description

Scales number from one range to another with an exponential curve. Both the input and output ranges are expressed as single arguments representing the maximum value. The minimum values are the negative values of the ranges (argument * -1).

Examples

Use linedrive for exponential value scaling

Arguments

input [number]

The first argument is the maximum input value. The range used is from (argument * -1) to (argument).

output [number]

The second argument is the maximum output value. The range used is from (argument * -1) to (argument).

curve [number]

The third argument specifies the nature of the scaling curve. The third argument must be greater than 1. The larger the value, the more steeply exponential the curve is. An appropriate value for this argument is 1.06.

delay [int]

Unitsms

The fourth argument specifies a ramp time (slew rate). The linedrive object outputs a list consisting of the scaled output value followed by a ramp time in milliseconds which can be sent to a line or line~ object. The initial argument value can be modifed using the linedrive object's right inlet.

Attributes

Common Box Attributes

Messages

int

Arguments

input [int]
In left inlet: The number is converted according to the following expression
y = b e^{-a log c} e^{x log c}
where x is the input, y is the output, a, b, and c are the three typed-in arguments, and e is the base of the natural logarithm (approximately 2.718282). The output is a two-item list containing y followed by the delay time most recently received in the right inlet.

  (inlet1)

Arguments

delay [int]
In right inlet: Sets the current delay time appended to the scaled output. A connected line~ object will ramp to the new target value over this time interval.

float

Arguments

input-to-conversion [float]
In left inlet: The number is converted according to the following expression
y = b e^{-a log c} e^{x log c}
where x is the input, y is the output, a, b, and c are the three typed-in arguments, and e is the base of the natural logarithm (approximately 2.718282). The output is a two-item list containing y followed by the delay time most recently received in the right inlet.

Output

list

When an int or float is received in the left inlet, a list is sent out containing a scaled version of the input (see the formula above) and the current delay time.

See Also

Name Description
expr
scale