# Wolfram Language & System 10.0 (2014)|Legacy Documentation

This is documentation for an earlier version of the Wolfram Language.
BUILT-IN WOLFRAM LANGUAGE SYMBOL

# Riffle

Riffle[{e1,e2,},x]
gives .

Riffle[{e1,e2,},{x1,x2,}]
gives .

Riffle[list,x,n]
yields a list in which every n element is x.

Riffle[list,x,{imin,imax,n}]
yields a list in which x appears if possible at positions , , , , .

## DetailsDetails

• If there are fewer than gaps between in Riffle[{e1,e2,},{x1,x2,}], the are used cyclically.
• Riffle[{e},x] gives {e}.
• The specification is of the type used in Take. Negative indices count from the end of the list.
• Riffle[list,x] is equivalent to Riffle[list,x,{2,-2,2}].
• Riffle[list,x,n] is equivalent to Riffle[list,x,{n,-2,n}].
• In Riffle[list,xlist], if list and xlist are of the same length, then their elements are directly interleaved, so that the last element of the result is the last element of xlist.
• Riffle works with SparseArray objects.

## ExamplesExamplesopen allclose all

### Basic Examples  (3)Basic Examples  (3)

Riffle between successive elements in a list:

 Out[1]=

Riffle in and cyclically:

 Out[1]=

Riffle in at every 3 position:

 Out[1]=