MissingFallback

MissingFallback[arg1,arg2,…]

gives the first argument argi that is not MissingQ.

Details

Examples

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Basic Examples  (2)

MissingFallback gives the first of its arguments that is not of the form Missing[…]:

If only missing elements are present, the last of them will be returned:

Use MissingFallback to replace missing values in a Tabular object with values of another column:

Use a fixed value instead:

Scope  (1)

Use functions of columns in MissingFallback to fill in missing values in a Tabular object:

Use the sum of row values from other columns:

Use the mean of row values from neighboring columns:

Applications  (1)

Construct a Tabular object with a column containing the moons of Pluto:

Some of those moons have a Missing["NotAvailable"] value for the "PolarRadius" property:

Use the "Radius" property as fallback:

Properties & Relations  (2)

If all arguments of MissingFallback are Missing[…] objects, the last one is returned:

The symbol Missing is not treated as a missing object:

Missing[] with no arguments is treated as a missing object:

Wolfram Research (2025), MissingFallback, Wolfram Language function, https://reference.wolfram.com/language/ref/MissingFallback.html.

Text

Wolfram Research (2025), MissingFallback, Wolfram Language function, https://reference.wolfram.com/language/ref/MissingFallback.html.

CMS

Wolfram Language. 2025. "MissingFallback." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/MissingFallback.html.

APA

Wolfram Language. (2025). MissingFallback. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/MissingFallback.html

BibTeX

@misc{reference.wolfram_2024_missingfallback, author="Wolfram Research", title="{MissingFallback}", year="2025", howpublished="\url{https://reference.wolfram.com/language/ref/MissingFallback.html}", note=[Accessed: 15-January-2025 ]}

BibLaTeX

@online{reference.wolfram_2024_missingfallback, organization={Wolfram Research}, title={MissingFallback}, year={2025}, url={https://reference.wolfram.com/language/ref/MissingFallback.html}, note=[Accessed: 15-January-2025 ]}