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 > Mathematics and Algorithms > Matrices and Linear Algebra > Parts of Matrices > UpperTriangularize >
Mathematica > Mathematics and Algorithms > Graphs & Networks > Graph Programming > Matrices and Linear Algebra > Parts of Matrices > UpperTriangularize >
Mathematica > Visualization and Graphics > Graphs & Networks > Graph Programming > Matrices and Linear Algebra > Parts of Matrices > UpperTriangularize >
BUILT-IN MATHEMATICA SYMBOLSee Also »|More About »

UpperTriangularize

UpperTriangularize[m]
gives a matrix in which all but the upper triangular elements of m are replaced with zeros.
UpperTriangularize
replaces with zeros only the elements below the k^(th) subdiagonal of m.
MORE INFORMATION
  • In UpperTriangularize, positive k refers to subdiagonals above the main diagonal and negative k refers to subdiagonals below the main diagonal.
EXAMPLESCLOSE ALL
Basic Examples   (2)
Get the upper triangular part of a matrix:
Get the strictly upper triangular part of a matrix:
Get the upper triangular part of a matrix:
In[1]:=
Click for copyable input
Out[1]//MatrixForm=
 
Get the strictly upper triangular part of a matrix:
In[1]:=
Click for copyable input
Out[1]//MatrixForm=
Scope   (2)
Get the upper triangular part of nonsquare matrices:
The number of rows or columns limits the meaningful values of the parameter k:
New in 7
Ask a question about this page  |  Suggest an improvement  |  Leave a message for the team
Format:   HTML  |  CDF