BUILT-IN WOLFRAM LANGUAGE SYMBOL

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.

DetailsDetails

  • returns Null, and prints no output.
  • Expressions like 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.

ExamplesExamplesopen allclose all

Basic Examples  (2)Basic Examples  (2)

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

In[1]:=
Click for copyable input

The full form of the output is Null:

In[2]:=
Click for copyable input
Out[2]//FullForm=

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

In[1]:=
Click for copyable input
In[2]:=
Click for copyable input
Out[2]=

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

In[3]:=
Click for copyable input
In[4]:=
Click for copyable input
Out[4]=
Introduced in 1988
(1.0)
| Updated in 2007
(6.0)