Mathematica 9 is now available
THIS IS DOCUMENTATION FOR AN OBSOLETE PRODUCT.
SEE THE DOCUMENTATION CENTER FOR THE LATEST INFORMATION.
Wolfram Mathematica Documentation Center
DOCUMENTATION CENTER SEARCH
New to Mathematica? Find your learning path »
Mathematica > Core Language > Rules & Patterns > Patterns > Blank (_) >
BUILT-IN MATHEMATICA SYMBOLTutorials »|See Also »|More About »

Blank

or Blank
is a pattern object that can stand for any Mathematica expression.
or Blank[h]
can stand for any expression with head h.
MORE INFORMATION
  • The head h in cannot itself contain pattern objects.
EXAMPLESCLOSE ALL
Basic Examples   (2)
A pattern that matches any expression:
A pattern that matches any symbol:
A function definition that will take any single argument:
A function definition for integer arguments only:
A pattern that matches any expression:
In[1]:=
Click for copyable input
Out[1]=
A pattern that matches any symbol:
In[2]:=
Click for copyable input
Out[2]=
 
A function definition that will take any single argument:
In[1]:=
Click for copyable input
In[2]:=
Click for copyable input
Out[2]=
A function definition for integer arguments only:
In[3]:=
Click for copyable input
In[4]:=
Click for copyable input
Out[4]=
New in 1
Ask a question about this page  |  Suggest an improvement  |  Leave a message for the team
Format:   HTML  |  CDF