DeleteMissing [list]
drops elements with head Missing from a list.
DeleteMissing [assoc]
drops elements whose values have head Missing from the association assoc.
DeleteMissing [expr,n]
applies DeleteMissing to any lists or associations that occur within the first n levels of expr.
DeleteMissing [expr,n,d]
considers an element at level n to be missing if Missing occurs within the first d levels of the element.
DeleteMissing
DeleteMissing [list]
drops elements with head Missing from a list.
DeleteMissing [assoc]
drops elements whose values have head Missing from the association assoc.
DeleteMissing [expr,n]
applies DeleteMissing to any lists or associations that occur within the first n levels of expr.
DeleteMissing [expr,n,d]
considers an element at level n to be missing if Missing occurs within the first d levels of the element.
Details
- DeleteMissing [{lhs1->rhs1,…}] deletes any elements of the list when rhsi has head Missing .
- DeleteMissing [expr,Infinity ] specifies that DeleteMissing should search to arbitrary depth for expressions with head Missing and delete them.
- DeleteMissing [expr,1,Infinity ] indicates that elements at the first level should be removed if they contain Missing at any depth.
- When searching multiple levels, DeleteMissing will only search within lists and associations and ignores expressions with other heads.
- DeleteMissing [Missing []] returns Sequence [].
Examples
open all close allBasic Examples (2)
Delete missing elements in a list:
Delete missing values from an association:
Scope (3)
Delete elements with head Missing up to level 2:
Delete missing elements at all levels:
Delete elements at level 1 if they contain an element with head Missing :
Delete elements at level 1 if they contain a missing expression anywhere inside:
DeleteMissing deletes complete rules when the right-hand side is Missing :
Properties & Relations (2)
DeleteMissing [expr] deletes missing elements at the top level only:
DeleteMissing [list] is effectively equivalent to DeleteCases [list,_Missing]:
Possible Issues (1)
DeleteMissing does not enter heads other than List or Association :
See Also
Related Guides
Text
Wolfram Research (2014), DeleteMissing, Wolfram Language function, https://reference.wolfram.com/language/ref/DeleteMissing.html (updated 2015).
CMS
Wolfram Language. 2014. "DeleteMissing." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2015. https://reference.wolfram.com/language/ref/DeleteMissing.html.
APA
Wolfram Language. (2014). DeleteMissing. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DeleteMissing.html
BibTeX
@misc{reference.wolfram_2025_deletemissing, author="Wolfram Research", title="{DeleteMissing}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/DeleteMissing.html}", note=[Accessed: 04-January-2026]}
BibLaTeX
@online{reference.wolfram_2025_deletemissing, organization={Wolfram Research}, title={DeleteMissing}, year={2015}, url={https://reference.wolfram.com/language/ref/DeleteMissing.html}, note=[Accessed: 04-January-2026]}