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7.5.19.0. UpOneMatrix
Procedure from library nctools.lib (see nctools_lib).

Usage:
UpOneMatrix(n); n an integer

Return:
intmat

Purpose:
compute an n x n matrix with 1's in the whole upper triangle

Note:
helpful for setting noncommutative algebras with complicated coefficient matrices

Example:
 
LIB "nctools.lib";
ring   r = (0,q),(x,y,z),dp;
matrix C = UpOneMatrix(3);
C[1,3]   = q;
print(C);
==> 0,1,(q),
==> 0,0,1,  
==> 0,0,0   
def S = nc_algebra(C,0); setring S;
S;
==> // coefficients: QQ(q)
==> // number of vars : 3
==> //        block   1 : ordering dp
==> //                  : names    x y z
==> //        block   2 : ordering C
==> // noncommutative relations:
==> //    zx=(q)*xz