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
v):
Use
Part to pick the third element of the list:
Or use
[[...]] (the short form notation for
Part):
Combine
;; (the short form for
Span) with
Part to pick out the elements from 1 to 5:
Pick out elements 5 through 8 of the list:
Pick the last 7 elements (negative indices count from the end):
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:
Use
MatrixForm to see it laid out as a matrix:
The first part of the matrix is the first row:
