Documentation
CalculationCenter
Functions
Lists & Matrices
List Operations
Position
Position[expr, pattern] gives a list of the positions at which objects matching pattern appear in expr.
Position[expr, pattern] tests all the subparts of expr in turn to try and find ones that match pattern.
A part specification {} returned by Position represents the whole of expr.
See also: Column, Insert, Take.

Examples
Using InstantCalculators
Here is the InstantCalculator for the Position function. Enter the parameters for your calculation and click Calculate to see the result.
In[1]:=
Out[1]=
Entering Commands Directly
You can paste a template for this command via the Text Input button on the Position Function Controller.
The symbol c occurs in the second and fourth positions of this list.
In[2]:=
Out[2]=
|