MATLAB Function Reference

triu

Upper triangular part of a matrix

Syntax

• U = triu(X)
  U = triu(X,k)
  

Description

U = triu(X) returns the upper triangular part of X.

U = triu(X,k) returns the element on and above the kth diagonal of X. k = 0 is the main diagonal, k > 0 is above the main diagonal, and k < 0 is below the main diagonal.

Examples

• triu(ones(4,4),-1)
  
  ans = 
  
      1    1    1    1
      1    1    1    1
      0    1    1    1
      0    0    1    1
  

See Also

diag, tril

trisurf

true