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LowerTriangularize

LowerTriangularize[m]
gives a matrix in which all but the lower triangular elements of m are replaced with zeros.
LowerTriangularize
replaces with zeros only the elements above the k^(th) subdiagonal of m.
MORE INFORMATION
  • In LowerTriangularize, 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 lower triangular part of a matrix:
Get the strictly lower triangular part of a matrix:
Get the lower triangular part of a matrix:
In[1]:=
Click for copyable input
Out[1]//MatrixForm=
 
Get the strictly lower triangular part of a matrix:
In[1]:=
Click for copyable input
Out[1]//MatrixForm=
Scope   (2)
Get the lower triangular part of nonsquare matrices:
The number of rows or columns limits the meaningful values of the parameter k:
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