Nulinvoer

Nulinvoer is a Dutch term that literally means zero input and is used in technical contexts to describe either an input that has a value of zero or the absence of external input to a system.

In control theory and signal processing, the term is related to the no-input or zero-input response of a dynamic system: when the input u(t) is set to zero, the system's behavior is governed solely by initial conditions, yielding the natural or free response. This differs from responses driven by nonzero inputs. The concept is used in teaching and analysis to illustrate how systems evolve without external excitation and to discuss aspects of stability and natural dynamics.

In computing and data handling, nulinvoer may appear in contexts involving sensors or data streams where a zero value is recorded as a valid measurement, or where an input field is left empty but defaults to zero. In practice, the term is less common than phrases such as nulwaarde (zero value) or geen invoer (no input), and its usage can vary by discipline and author.

Etymology and usage: the term combines nul (zero) and invoer (input) in Dutch. It is found primarily in Dutch technical literature and educational settings, with variations such as nulinvoer also encountered. Because Dutch technical language often borrows from English, terms like no-input or zero-input may appear, leading to variability in how nulinvoer is used across fields.

See also: Zero-input response; Null input; Default value.