- feedback node
Similar to a Shift Register, but having parts that may be moved around inside a loop, rather than attached to the loop wall. Used to pass data from one iteration of a loop to the next.
- FFT
Fast Fourier transform.
- file marker
The current position in a file where read or write operations will occur, if not explicitly specified. The File Marker is automatically shifted, when file read and write operations are performed, by the number of bytes read or written. This is also referred to as the File Position.
- file position
See File Marker.
- file refnum
An identifier that LabVIEW associates with a file when you open it. You use the file refnum to specify that you want a function or VI to perform an operation on the open file.
- filter event
A special type of event that may be filtered programmatically inside an Event Structure. The data may be filtered or the event may be filtered, altogether. Filter Events will have an Event Filter Node on the right side of the event case.
- find and replace
A LabVIEW feature that allows you to find objects and text, as well as replace the search result items with other objects and text.
- flat sequence structure
A Sequence Structure whose subdiagram frames are organized from left to right, side-by-side. This is visually different, but functionally almost identical, to a Stacked Sequence Structure.
- flattened data
Data of any type that have been converted to a string, usually for writing it to a file.
- floating signal
A signal source in which the voltage signal is not referenced to any common ground, such as earth or building ground.
- for loop
Iterative loop structure that executes its subdiagram a set number of times. Equivalent to conventional code: For I = 0 to n 1, do . . .
- format and precision
The display properties of a numeric control or indicator. For example: scientific, engineering, decimal, number of decimal places, zero padding, and so on.
- formatting string
A string that uses special formatting codes to define the format and precision of a numeric, for display or string representation.
- formula node
Node that executes formulas that you enter as text. Especially useful for lengthy formulas that would be cumbersome to build in block diagram form.
- frame
Subdiagram of a Sequence Structure.
- free label
Label on the front panel or block diagram that does not belong to any other object.
- frequency
The rate at which something occursevents per unit time. See also Hertz.
- front panel
The interactive user interface of a VI. Modeled from the front panel of physical instruments, it is composed of switches, slides, meters, graphs, charts, gauges, LEDs, and other controls and indicators.
- function
Built-in execution element, comparable to an operator, function, or statement in a conventional language.
- functions palette
Palette containing block diagram structures, constants, communication features, and VIs.
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