# 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.

# Details

• 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].

# Examples

open allclose all

## 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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