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D.3.2.17 hessenberg

Procedure from library linalg.lib (see linalg_lib).

Usage:
hessenberg(M); matrix M

Assume:
M constant square matrix

Return:
matrix H; Hessenberg form of M

Example:
 
LIB "linalg.lib";
ring R=0,x,dp;
matrix M[3][3]=3,2,1,0,2,1,0,0,3;
print(M);
==> 3,2,1,
==> 0,2,1,
==> 0,0,3 
print(hessenberg(M));
==> 3,2,1,
==> 0,2,1,
==> 0,0,3