Unique

Unique[]

generates a new symbol, whose name is of the form $nnn.

Unique[x]

generates a new symbol, with a name of the form x$nnn.

Unique[{x,y,}]

generates a list of new symbols.

Unique["xxx"]

generates a new symbol, with a name of the form xxxnnn.

Details

  • Unique[x] numbers the symbols it creates using $ModuleNumber, and increments $ModuleNumber every time it is called.
  • Unique["xxx"] numbers the symbols it creates sequentially, starting at 1 for each string xxx.
  • Unique[name,{attr1,attr2,}] generates a symbol that has the attributes attri.

Examples

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Basic Examples  (1)

Scope  (3)

Create a unique symbol with no particular name:

Create a unique symbol whose name begins with x:

Create a unique symbol in the way Module does:

Properties & Relations  (3)

Each use of Unique[symbol] increments $ModuleNumber:

Unique[symbol] creates symbols in the same way Module does:

Unique["x"] uses the first unused symbol of the form xnnn:

Introduced in 1988
 (1.0)