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    Identity Function

    Usage

    Identity[expr] gives expr (the identity operation).

    Basic example

    In[1]:=Identity[x + y] Out[1]=x + y

    Attribute

    Protected

    Relationships with other entities

    Composition | Construct | Comap | InverseFunction | Sequence | Hold | IdentityMatrix

    Typical ranks of usage in programs

    322nd most common (1 in 11400 symbols)

    432nd most common (1 in 21800 symbols)

    708th most common (1 in 12000 symbols)

    History

    introduced in Version 1 (June 1988)

    Timeline

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