function ident(sessname,pathname)
%IDENT  Starts the Graphical User Interface for the System Identification Toolbox.
%
%   ident   or  ident(SESSION,PATH)
%
%   IDENT by itself opens the main interface window.
%   SESSION is a SITB session file (typically with extension .sid)
%   PATH is the search path for this file. (Not necessary if on the
%   MATHLABPATH.) When SESSION is specified, the interface opens
%   with this session.
%
%   When the interface is active, ident(SESSION,PATH) will open the
%   session SESSION.

%   L. Ljung 4-4-94
%   Copyright 1986-2004 The MathWorks, Inc.
%   $Revision: 1.13.4.1 $  $Date: 2004/07/31 23:22:13 $


set(0,'showhiddenhandle','on');
Xfake = findobj(get(0,'children'),'flat','tag','sitb16','name','FAKE');
if ~isempty(Xfake)
    close(Xfake);
end
XIDmain_win=findobj(get(0,'children'),'flat','tag','sitb16');
set(0,'showhiddenhandle','off');
if isempty(XIDmain_win)
    fprintf('Opening ident .')
    if exist('idprefs.mat')
        load idprefs
        XID.sessions = XIDsessions;
        XID.layout = XIDlayout;
        try
            XID.laypath = which('idprefs.mat');
            XID.laypath = XID.laypath(1:end-11);
        catch
            XID.laypath = XIDlaypath;
        end
        try
            XID.plotprefs = XIDplotprefs;
            XID.styleprefs = XIDstyleprefs;
        catch
            XID.plotprefs =[];
            XID.styleprefs = [];
        end
        [nr,nc]=size(XID.sessions);
        if nr<8
            pn1 = which('iddata1.sid'); pn1 = pn1(1:end-11);
            pn2 = which('iddata7.sid'); pn2 = pn2(1:end-11);
            pn3 = which('dryer.sid'); pn3 = pn3(1:end-9);
            pn4 = which('steam.sid'); pn4 = pn4(1:end-9);
            XID.sessions=str2mat('iddata1.sid',pn1,'iddata7.sid',...
                pn2,...
                'dryer.sid',pn3,'steam.sid',pn4);
        end
    else
        XID.laypath=which('startup');
        XID.layout=[];XID.styleprefs=[];XID.plotprefs=[];
        pn1 = which('iddata1.sid'); pn1 = pn1(1:end-11);
        pn2 = which('iddata7.sid'); pn2 = pn2(1:end-11);
        pn3 = which('dryer.sid'); pn3 = pn3(1:end-9);
        pn4 = which('steam.sid'); pn4 = pn4(1:end-9);
        XID.sessions=str2mat('iddata1.sid',pn1,'iddata7.sid',...
            pn2,...
            'dryer.sid',pn3,'steam.sid',pn4);
        err=0;
        lx=length(XID.laypath);
        if lx<10
            err=1; XID.laypath=[];
        else
            XID.laypath=XID.laypath(1:lx-9);
            XIDsessions = XID.sessions;
            XIDlaypath = XID.laypath;
            XIDlayout = XID.layout;
            XIDplotprefs = XID.plotprefs;
            XIDstyleprefs = XID.styleprefs;
            eval(['save ',XIDlaypath,...
                'idprefs.mat XIDlaypath XIDsessions XIDlayout ',...
                'XIDstyleprefs XIDplotprefs'],'err=1;')
            testlay=exist('idprefs.mat');
            if ~testlay&~err,err=1;eval(['delete ',XIDlaypath,'idprefs.mat']);end
        end
        if err==0
            wtext=str2mat('',['Created preference file ',...
                XIDlaypath,'idprefs.mat.'],...
                'Type HELP MIDPREFS if you want to move this file.');
            disp(wtext)
            % $$$       else
            % $$$          wtext=str2mat('',...
            % $$$                'Warning: Could not find idprefs.mat and could not create',...
            % $$$                '         PrefDir/idprefs.mat',...
            % $$$                ['You may ignore this warning or type HELP',...
            % $$$                ' MIDPREFS for your options.']);
            % $$$          disp(wtext)
        end
    end

    zzz=rand(100,2);
    tic,arx(zzz,[4 4 1]);t=toc;
    XID.counters(6)=t/2;
    eval('sumboard(XID);')
    eval('idmwwb(1);iduidrop;')
else
    figure(XIDmain_win)
end
if nargin>0
    pkt = findstr(sessname,'.');
    if isempty(pkt)
        sessname = [sessname,'.sid'];
    end
    if nargin<2,
        pathname=which(sessname);pathname=pathname(1:end-length(sessname));
    end
    set(0,'showhiddenhandles','on')
    eval('iduisess(''load'',pathname,sessname);')
    set(0,'showhiddenhandles','off')

end