Home > eeg > egis > scripts > coherence_surface.m

coherence_surface

PURPOSE ^

status =coherence_surface(freqs,obs,array,lines,coherencefname);

SYNOPSIS ^

function status =coherence_surface(freqs,obs,array,lines,coherencefname);

DESCRIPTION ^

status =coherence_surface(freqs,obs,array,lines,coherencefname);

freqs = frequencies to plot, e.g. [3:30] limits the plot to 3 to 30 Hz  
obs = observations in the coherence file to plot (defaults to all)
array = either an array name,e.g., 'all','hemisphere','quadrant','frontback',
    or 'oned' or a list of channels
lines = 'black' or 'color'
coherencefname = coherencefilename (can be gui by skipping this param)

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function status =coherence_surface(freqs,obs,array,lines,coherencefname);
0002 %status =coherence_surface(freqs,obs,array,lines,coherencefname);
0003 %
0004 %freqs = frequencies to plot, e.g. [3:30] limits the plot to 3 to 30 Hz
0005 %obs = observations in the coherence file to plot (defaults to all)
0006 %array = either an array name,e.g., 'all','hemisphere','quadrant','frontback',
0007 %    or 'oned' or a list of channels
0008 %lines = 'black' or 'color'
0009 %coherencefname = coherencefilename (can be gui by skipping this param)
0010 %
0011 
0012 if nargin < 5
0013     [fid] = get_fid('rb');
0014 else
0015     fid = fopen(coherencefname,'rb');
0016 end;
0017 version = fread(fid,1,'int16');
0018 if version ~= -2
0019     error('this is not a coherence file');
0020 end;
0021  [nfiles,obs_labels,Epoch,Window_Length,NEpoch,Nbad_chan,bad_chan,ref_flag,reference,NChan,NFreq] = rd_anal_hdr(fid);
0022 frewind(fid);
0023 if nargin == 0
0024     freqs = [0:40];
0025     obs = [1:nfiles];
0026     array = 'all';
0027     lines = 'black';
0028 end;
0029 if nargin == 1
0030     obs = [1:nfiles];
0031     array = 'all';
0032     lines = 'black';
0033 end;        
0034 if nargin == 2
0035     array = 'all';
0036     lines = 'black';
0037 end;    
0038 if nargin == 3
0039     lines = 'black';
0040 end;
0041 if isempty(lines)
0042     lines = 'black';
0043 end
0044 if isempty(array)
0045     array = 'all';
0046 end
0047 if isempty(obs)
0048     obs = [1:nfiles];
0049 end;
0050 if isempty(freqs)
0051     freqs = [0:40];
0052 end;
0053 
0054 ch_pair_indices;
0055 if strcmp(lines,'black')
0056 colorpalette = 'gray';
0057 else    
0058 colorpalette = 'hot';
0059 end;
0060 coherencemax = 1;
0061 iline = 1;
0062 [xelec,yelec,zelec] = electrodes(129);
0063 twod_dist = real(twod_pos(xelec,yelec,zelec,9.2));
0064 if isstr(array)
0065     [arrayg,gnames] = arrays(array,[]);
0066 else
0067     arrayg = array;
0068 end
0069 for g = 1:size(arrayg,1)
0070     for io = 1:size(obs,2)
0071         figure
0072         [npairs, pairs, pairnames] = look_up_pairs(array,g,bad_chan,obs(io));
0073         version = fread(fid,1,'int16');
0074         [nfiles,obs_labels,Epoch,Window_Length,NEpoch,Nbad_chan,bad_chan,ref_flag,reference,NChan,NFreq] = rd_anal_hdr(fid);
0075         coherence_array = real(get_eeg_coherence(fid,freqs,obs(io),nfiles,NChan,NFreq,Epoch));                                
0076         for j = 1:size(freqs,2)        
0077             p_coh = polyfit(twod_dist(pairs),coherence_array(j,pairs),4);
0078             coh_fit(j,:) = real(polyval(p_coh,[0:1:fix(max(twod_dist(pairs)))]));    
0079         end;        
0080         distance = [0:1:fix(max(twod_dist(pairs)))];
0081         surf(distance,freqs,coh_fit), colormap(colorpalette),colorbar
0082         axis([0 max(twod_dist(pairs)) 0 max(freqs) 0 1]);
0083         view(45,30)
0084         ylabel('Frequency(Hz)')
0085         xlabel('Interelectrode Distance (cm)')
0086         zlabel('Coherence')
0087         title([ deblank(setstr(obs_labels(obs(io),:))) ' ' pairnames]);
0088     end
0089 end
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