$Aborted

is a special symbol that is returned as the result from a calculation that has been aborted.

Examples

Basic Examples (2)

$Aborted is returned by a calculation that was aborted:

Wolfram Language code: Print[a];Abort[];Print[b]

$Aborted is returned by TimeConstrained when a calculation exceeds its given time constraint:

Wolfram Language code: TimeConstrained[Pause[2], 1]

$Aborted is returned by MemoryConstrained when a calculation exceeds its given memory constraint:

Wolfram Language code: MemoryConstrained[Range[10 ^ 6], 10000]

Try a computation with exact arithmetic and fall back to machine arithmetic if it is too slow:

Wolfram Language code:

f[n_] := Module[{g = 4 #(1 - #)&}, 
	x = TimeConstrained[Nest[g, 1 / 10, n], 1];
	If[x === $Aborted, x = Nest[g, .1, n]];
	x]

Wolfram Language code: f[4]

Wolfram Language code: f[100]

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