Riffle
Details
- If there are fewer xi than gaps between ei in Riffle [{e1,e2,…},{x1,x2,…}], the xi are used cyclically.
- Riffle [{e},x] gives {e}.
- The specification {imin,imax,n} 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.
Examples
open all close allBasic Examples (3)
Riffle x between successive elements in a list:
Riffle in x and y cyclically:
Riffle in x at every 3^(rd) position:
Scope (7)
Riffle in x at every other position:
Include x at the beginning and end:
Use step 3:
Start riffling in x only at position 5:
Cyclically riffle in x and y:
Intersperse two lists:
Riffle works on SparseArray objects:
Applications (5)
Insert spaces between words:
Create a directory name from a path list:
Insert 0s between successive integers:
Alternate positive and negative integers:
Insert commas at every 4^(th) character:
See Also
StringRiffle Insert Take PadLeft DelimitedSequence
Function Repository: Shuffle InShuffle OutShuffle BisectList EveryOther
Related Guides
History
Text
Wolfram Research (2007), Riffle, Wolfram Language function, https://reference.wolfram.com/language/ref/Riffle.html.
CMS
Wolfram Language. 2007. "Riffle." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/Riffle.html.
APA
Wolfram Language. (2007). Riffle. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Riffle.html
BibTeX
@misc{reference.wolfram_2025_riffle, author="Wolfram Research", title="{Riffle}", year="2007", howpublished="\url{https://reference.wolfram.com/language/ref/Riffle.html}", note=[Accessed: 04-January-2026]}
BibLaTeX
@online{reference.wolfram_2025_riffle, organization={Wolfram Research}, title={Riffle}, year={2007}, url={https://reference.wolfram.com/language/ref/Riffle.html}, note=[Accessed: 04-January-2026]}