Null

Null

is a symbol used to indicate the absence of an expression or a result. It is not displayed in ordinary output.

When Null appears as a complete output expression, no output is printed.

Details

  • e1;e2;;ek; returns Null, and prints no output.
  • Expressions like f[e1,,e2] are interpreted to have Null between each pair of adjacent commas.
  • Null represents the absence of content or elements in such constructs as InputField or Grid.

Examples

Basic Examples  (2)

When a sequence of commands ends with a semicolon, no output is shown:

The full form of the output is Null:

If you forget a semicolon in a program you may see output with Null in it:

This is because the whitespace is interpreted as multiplication. Redefine with a semicolon:

Wolfram Research (1988), Null, Wolfram Language function, https://reference.wolfram.com/language/ref/Null.html (updated 2007).

Text

Wolfram Research (1988), Null, Wolfram Language function, https://reference.wolfram.com/language/ref/Null.html (updated 2007).

BibTeX

@misc{reference.wolfram_2020_null, author="Wolfram Research", title="{Null}", year="2007", howpublished="\url{https://reference.wolfram.com/language/ref/Null.html}", note=[Accessed: 14-April-2021 ]}

BibLaTeX

@online{reference.wolfram_2020_null, organization={Wolfram Research}, title={Null}, year={2007}, url={https://reference.wolfram.com/language/ref/Null.html}, note=[Accessed: 14-April-2021 ]}

CMS

Wolfram Language. 1988. "Null." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2007. https://reference.wolfram.com/language/ref/Null.html.

APA

Wolfram Language. (1988). Null. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Null.html