NoneTrue

NoneTrue[{e1,e2,},test]
yields True if test[ei] is False for all of the ei.

NoneTrue[expr,test,level]
tests parts of expr at level level.

NoneTrue[test]
represents an operator form of NoneTrue that can be applied to an expression.

DetailsDetails

  • NoneTrue[list,test] and NoneTrue[expr,test,level] only evaluate as many test[ei] as are necessary to determine the result.
  • NoneTrue[list,test] is equivalent to NoneTrue[list,test,1].
  • NoneTrue[test][list] is equivalent to NoneTrue[list,test].

ExamplesExamplesopen allclose all

Basic Examples  (4)Basic Examples  (4)

Check if no element of a list satisfies a condition:

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Check if no element of a matrix satisfies a condition:

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Check if no value of an association satisfies a condition:

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A symbolic result may be returned:

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Even when the condition applied to some elements is symbolic, a definitive result may be deduced:

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TrueQ may be used to avoid getting a symbolic result:

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Introduced in 2014
(10.0)
| Updated in 2015
(10.1)
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