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D.3.2.15 U_D_O

Procedure from library linalg.lib (see linalg_lib).

Usage:
U_D_O(A); constant invertible matrix A

Return:
list Z: Z[1]=P , Z[2]=U , Z[3]=D , Z[4]=O
gives a permutation matrix P,
a normalized lower triangular matrix U ,
a diagonal matrix D, and
a normalized upper triangular matrix O
with P*A=U*D*O

Note:
Z[1]=-1 means that A is not regular (proc uses gaussred)

Example:
 


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