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Null
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Null

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is a symbol used to indicate the absence of an expression or a result. When it 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)Summary of the most common use cases

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

In[1]:=1
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https://wolfram.com/xid/0dek1e-dcgca

The full form of the output is Null:

In[2]:=2
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https://wolfram.com/xid/0dek1e-ce8awk

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

In[1]:=1
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https://wolfram.com/xid/0dek1e-eo9vab
In[2]:=2
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https://wolfram.com/xid/0dek1e-bkoifv
Out[2]=2

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

In[3]:=3
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https://wolfram.com/xid/0dek1e-j4im7i
In[4]:=4
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https://wolfram.com/xid/0dek1e-lrh4r9
Out[4]=4
Wolfram Research (1988), Null, Wolfram Language function, https://reference.wolfram.com/language/ref/Null.html (updated 2007).
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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).

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

CMS

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

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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

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

BibTeX

@misc{reference.wolfram_2025_null, author="Wolfram Research", title="{Null}", year="2007", howpublished="\url{https://reference.wolfram.com/language/ref/Null.html}", note=[Accessed: 16-April-2025 ]}

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@misc{reference.wolfram_2025_, author="Wolfram Research", title="{Null}", year="2007", howpublished="\url{https://reference.wolfram.com/language/ref/Null.html}", note=[Accessed: 16-April-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_null, organization={Wolfram Research}, title={Null}, year={2007}, url={https://reference.wolfram.com/language/ref/Null.html}, note=[Accessed: 16-April-2025 ]}

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@online{reference.wolfram_2025_, organization={Wolfram Research}, title={Null}, year={2007}, url={https://reference.wolfram.com/language/ref/Null.html}, note=[Accessed: 16-April-2025 ]}