PRODUCTS
Mathematica
Mathematica Home Edition
Mathematica for Students
Mathematica for the Classroom
grid
Mathematica
Wolfram Lightweight Grid Manager
web
Mathematica
Mathematica Player
(free download)
Mathematica Player Pro
Wolfram
Workbench
Mathematica
Applications
SOLUTIONS
Engineering
Aerospace Engineering & Defense
Chemical Engineering
Electrical Engineering
Image Processing
Industrial Engineering
Materials Science
Mechanical Engineering
Operations Research
Optics
Petroleum Engineering
Biotechnology & Medicine
Bioinformatics
Medical Imaging
Finance, Statistics, & Business Analysis
Actuarial Sciences
Data Analysis & Mining
Econometrics
Economics
Financial Engineering & Mathematics
Financial Risk Management
Statistics
Software Engineering & Content Delivery
Authoring & Publishing
Interface Development
Software Engineering
Web Development
Science
Astronomy
Biological Sciences
Chemistry
Environmental Sciences
Geosciences
Social & Behavioral Sciences
Design, Arts, & Entertainment
Game Design, Special Effects, & Generative Art
Education
Higher Education
Precollege Education
Students
Technology
Interactive Deployment
High-Performance & Parallel Computing (HPC)
See Also: Technology Guide
PURCHASE
Online Store
Other Ways to Buy
Volume & Site Licensing
Contact Sales
Software
Service
Upgrades
Training
Books
FOR USERS
All User Resources
Product Registration
Technical Support
Customer Service
Developer Support
Does My Site Have a License?
Free Seminars
Learning Center
Training
Custom Group Seminars
Documentation & Examples
Tutorial Screencasts
Video Gallery
Demonstrations Project
Education Portal
Student Resources
COMPANY
About Wolfram Research
News & Events
Wolfram Blog
Employment Opportunities
History of
Mathematica
Stephen Wolfram's Home Page
Contact Us
OUR SITES
Wolfram|Alpha
Demonstrations Project
Wolfram Blog
MathWorld
Integrator
Wolfram Functions Site
Mathematica Journal
Wolfram Library Archive
Wolfram
Tones
Wolfram Science
Stephen Wolfram
DOCUMENTATION CENTER SEARCH
Mathematica
>
Mathematics and Algorithms
>
Matrices and Linear Algebra
>
Constructing Matrices
>
Built-in
Mathematica
Symbol
Vectors and Matrices
Constructing Matrices
Tutorials »
|
DiagonalMatrix
KroneckerDelta
UnitVector
Table
See Also »
|
Constructing Matrices
Geometric Transforms
Matrices and Linear Algebra
Structure Matrices & Convolution Kernels
Summary of New Features in 7.0
New in 7.0: Lists and Matrices
More About »
IdentityMatrix
IdentityMatrix
[
n
]
gives the
n
×
n
identity matrix.
MORE INFORMATION
IdentityMatrix
[{
m
,
n
}]
gives the
m
×
n
identity matrix.
IdentityMatrix
by default creates a matrix containing exact integers.
The option
WorkingPrecision
can be used to specify the precision of matrix elements.
IdentityMatrix
[
n
,
SparseArray
]
gives the identity matrix as a
SparseArray
object.
EXAMPLES
CLOSE ALL
Basic Examples
(1)
Construct a 3×3 identity matrix:
In[1]:=
Out[1]//MatrixForm=
Scope
(1)
Options
(1)
Properties & Relations
(3)
Possible Issues
(1)
SEE ALSO
DiagonalMatrix
KroneckerDelta
UnitVector
Table
TUTORIALS
Vectors and Matrices
Constructing Matrices
MORE ABOUT
Constructing Matrices
Geometric Transforms
Matrices and Linear Algebra
Structure Matrices & Convolution Kernels
Summary of New Features in 7.0
New in 7.0: Lists and Matrices
New in 1 | Last modified in 7
EXAMPLES
Basic Examples 
Scope 