This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
How to | Get Elements of Lists
Lists are very important structures in Mathematica. Lists allow you treat any kind of collection of objects as a single entity. Sometimes you need to pick out or extract individual elements or groups of elements from a list.
Set up a list of the first 10 squares (stored as ):
 Out[256]=
Use Part to pick the third element of the list:
 Out[257]=
Or use (the short form notation for Part):
 Out[258]=
Combine (the short form for Span) with Part to pick out the elements from 1 to 5:
 Out[259]=
Pick out elements 5 through 8 of the list:
 Out[260]=
Pick the last 7 elements (negative indices count from the end):
 Out[261]=

A matrix in Mathematica is a list of lists of the same length. You can pick out elements from a matrix just like you would from a list.
Set up a 5×5 matrix of integers:
 Out[262]=
Use MatrixForm to see it laid out as a matrix:
 Out[263]//MatrixForm=
The first part of the matrix is the first row:
 Out[264]=