DATA NOT FOUND
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DATA_NOT_FOUND is a text string that represents data that does not exist.
For example, a TARGET that has a reliability of -1 does not exist, and is set internally to DATA_NOT_FOUND
Under many conditions a signal may have a value that cannot be interpreted mathematically.
One example is a TARGET that is occluded in a frame (e.g. a reliability of -1)
NO_DATA
NO_DATA is a text string used in Visual3D commands to represent DATA_NOT_FOUND
NO DATA
Some users may inadvertently omit the underscore, as does the wiki presentation.
NaN
NaN is a text string used by Matlab to indicate Not a Number
DATA_NOT_FOUND is not equivalent to NaN in Matlab because Visual3D will process a signal that contains DATA_NOT_FOUND entries.