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

Examples

open allclose all

Basic 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:

Wolfram Research (2014), DeleteMissing, Wolfram Language function, https://reference.wolfram.com/language/ref/DeleteMissing.html (updated 2015).

Text

Wolfram Research (2014), DeleteMissing, Wolfram Language function, https://reference.wolfram.com/language/ref/DeleteMissing.html (updated 2015).

BibTeX

@misc{reference.wolfram_2020_deletemissing, author="Wolfram Research", title="{DeleteMissing}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/DeleteMissing.html}", note=[Accessed: 28-February-2021 ]}

BibLaTeX

@online{reference.wolfram_2020_deletemissing, organization={Wolfram Research}, title={DeleteMissing}, year={2015}, url={https://reference.wolfram.com/language/ref/DeleteMissing.html}, note=[Accessed: 28-February-2021 ]}

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