Wolfram Language & System 10.3 (2015)|Legacy Documentation

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gives .

gives .

yields a list in which every n^(th) element is x.

yields a list in which x appears if possible at positions , , , , .


  • 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.
Introduced in 2007