SEARCH MATHEMATICA 8 DOCUMENTATION

THIS IS DOCUMENTATION FOR AN OBSOLETE PRODUCT.
SEE THE DOCUMENTATION CENTER FOR THE LATEST INFORMATION.

Mathematica >

Built-in Mathematica 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.

MORE INFORMATION

e₁;e₂;...;e_k; 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

CLOSE ALL

Basic Examples (2)

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

In[1]:=

The full form of the output is Null:

In[2]:=

Out[2]//FullForm=

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

In[1]:=

In[2]:=

Out[2]=

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

In[3]:=

In[4]:=

Out[4]=