msc2f.m

GPS software toolbox for GPS receiver development

%   				                   msc2f.m
%  Scope:   This MATLAB macro determines the real symmetric matrix stored as
%           a two-dimensional array from its upper triangular part stored 
%           columnwise as a one-dimensional array.
%  Usage:   xout = msc2f(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 upper triangular part of the symmetric matrix
%           xout - output, two-dimensional array storing the full symmetric
%                  matrix
%  Last update:  07/19/00
%  Copyright (C) 1996-00 by LL Consulting. All Rights Reserved.

function   xout = msc2f(n,a)

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