mudc2f.m

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%   				                  mudc2f.m
%  Scope:   This MATLAB macro determines the full U and D matrices stored as
%           two-dimensional arrays from its compact upper triangular part stored 
%           columnwise as a one-dimensional array.
%  Usage:   [u,d] = mudc2f(n,a)
%  Description of parameters:
%           n    - input, real scalar, number of rows and columns of the 
%                  symmetric matrix
%           a    - input, one-dimensional array of length  n*(n+1)/2, storing 
%                  columnwise the U-D components of a symmetric matrix
%           u    - output, two-dimensional array storing the full U matrix
%           d    - output, two-dimensional array storing the full D matrix
%  Last update:  07/19/00
%  Copyright (C) 1996-00 by LL Consulting. All Rights Reserved.

function   [u,d] = mudc2f(n,a)

temp = zeros(1,n);
u = zeros(n,n);
d = zeros(n,n);
kt = 0;
for k = 1:n
   i = 0;
   ktt = kt;
   for kk = 1:k
      i = i + 1;
      ktt = ktt + 1;
      temp(i) = 0;
      kt = kt + 1;
   end
   temp(i) = 1.;
   d(k,k) = a(ktt);
   if  (k ~= n)
      for  kk = k:n-1
         ktt = ktt + kk;
         i = i + 1;
         temp(i) = a(ktt);
      end
   end
   u(k,:) = temp(1,:);
end