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function [x0,X0,Y0] = initial_point(filename,mDIM,nBLOCK,bLOCKsTRUCT)
%
% Read in a sparse initial point file
%
% [x0,X0,Y0] = initial_point(fname, mDIM, nBLOCK, bLOCKsTRUCT)
%
% <INPUT>
% - filename : string ; filename of initial point file
% - mDIM : integer; number of primal variables
% - nBLOCK : integer; number of blocks of F
% - bLOCKsTRUCT: vector ; represetns the block structure of F
%
% <OUTPUT>
% - x0: vector ; initial point of x
% - X0: cell array; initial point of X
% - Y0: cell array; initial point of Y
%
% This file is a component of SDPA
% Copyright (C) 2004-2020 SDPA Project
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; if not, write to the Free Software
% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
%
% SDPA-M: $Revision: 6.2 $
% $Id: initial_point.m,v 6.2 2005/05/28 02:36:40 drophead Exp $
% check the validity of arguments
if nargin ~= 4
error('input arguments must be 4.');
else
if ~ischar(filename)
error('1st argument must be a filename.');
end
end
% identify whether a file is sparse format or not.
bsparse=0;
len=length(filename);
if len >= 2
str=filename(end-1:end);
if strncmp(str,'-s',2)
bsparse=1;
end
end
% disp(sprintf('sparse=%d',bsparse));
fid=fopen(filename,'r');
if fid == -1
error(sprintf('Cannot open %s',filename));
end
x0=zeros(mDIM,1);
X0=cell(nBLOCK,1);
Y0=cell(nBLOCK,1);
% read initial point x0
for idx=1:mDIM
x0(idx)=fscanf(fid,'%*[^0-9+-]%lg',1);
end
% read initial points X0, Y0
if bsparse
% sparse format case
while 1
[k,cnt]=fscanf(fid,'%*[^0-9+-]%d',1);
[l,cnt]=fscanf(fid,'%*[^0-9+-]%d',1);
[i,cnt]=fscanf(fid,'%*[^0-9+-]%d',1);
[j,cnt]=fscanf(fid,'%*[^0-9+-]%d',1);
[value,cnt]=fscanf(fid,'%*[^0-9+-]%lg',1);
if cnt
if k == 1
% X0
if isempty(X0{l})
size=abs(bLOCKsTRUCT(l));
if bLOCKsTRUCT(l) < 0
X0{l}=sparse(zeros(size,1));
else
X0{l}=sparse(zeros(size));
end
end
if bLOCKsTRUCT(l) < 0
X0{l}(i)=value;
else
if i < j
X0{l}(i,j)=value;
X0{l}(j,i)=value;
elseif i == j
X0{l}(i,j)=value;
end
end
elseif k==2
% Y0
if isempty(Y0{l})
size=abs(bLOCKsTRUCT(l));
if bLOCKsTRUCT(l) < 0
Y0{l}=sparse(zeros(size,1));
else
Y0{l}=sparse(zeros(size));
end
end
if bLOCKsTRUCT(l) < 0
Y0{l}(i)=value;
else
if i < j
Y0{l}(i,j)=value;
Y0{l}(j,i)=value;
elseif i == j
Y0{l}(i,j)=value;
end
end
end
else
break;
end
end
else
% dense format case
% X0
for l=1:nBLOCK
size=abs(bLOCKsTRUCT(l));
if bLOCKsTRUCT(l) > 0
X0{l}=zeros(size);
for i=1:size
for j=1:size
[value,cnt]=fscanf(fid,'%*[^0-9+-]%lg',1);
if cnt
X0{l}(i,j)=value;
else
error(sprintf('Failed to read an element X0 at %d %d %d'),...
l,i,j);
end
end
end
else
X0{l}=zeros(size,1);
for i=1:size
[value,cnt]=fscanf(fid,'%*[^0-9+-]%lg',1);
if cnt
X0{l}(i)=value;
else
error(sprintf('Failed to read an element X0 at %d %d %d'),...
l,i,i);
end
end
end
end
% Y0
for l=1:nBLOCK
size=abs(bLOCKsTRUCT(l));
if bLOCKsTRUCT(l) > 0
Y0{l}=zeros(size);
for i=1:size
for j=1:size
[value,cnt]=fscanf(fid,'%*[^0-9+-]%lg',1);
if cnt
Y0{l}(i,j)=value;
else
error(sprintf('Failed to read an element Y0 at %d %d %d'),...
l,i,j);
end
end
end
else
Y0{l}=zeros(size,1);
for i=1:size
[value,cnt]=fscanf(fid,'%*[^0-9+-]%lg',1);
if cnt
Y0{l}(i)=value;
else
error(sprintf('Failed to read an element Y0 at %d %d %d'),...
l,i,i);
end
end
end
end
end
fclose(fid);
% End of File
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