Length
Length[expr]
gives the number of elements in expr.
Details
- When expr is a SparseArray, StructuredArray, or Association object, Length[expr] returns the length of the corresponding ordinary list. »
- Otherwise, Length[expr] returns 0 whenever AtomQ[expr] is True.
Examples
open allclose allBasic Examples (2)
Find the length of an Association:
Scope (2)
Generalizations & Extensions (5)
Applications (5)
Properties & Relations (1)
Possible Issues (5)
See Also
LeafCount ByteCount Dimensions Depth StringLength AtomQ ComplexityFunction LengthWhile CountDistinct
Tutorials
Related Guides
Related Links
- An Elementary Introduction to the Wolfram Language: Operations on Lists
- An Elementary Introduction to the Wolfram Language: Strings and Text
- An Elementary Introduction to the Wolfram Language: Ways to Apply Functions
- An Elementary Introduction to the Wolfram Language: Expressions and Their Structure
- NKS|Online (A New Kind of Science)
Introduced in 1988
(1.0)
| Updated in 2014 (10.0)