Home > eeg > egis > scripts > coherence_contours.m

coherence_contours

PURPOSE ^

status =coherence_contours(freqs,obs,array,coherencefname);

SYNOPSIS ^

function status =coherence_contours(freqs,obs,array,coherencefname);

DESCRIPTION ^

status =coherence_contours(freqs,obs,array,coherencefname);

generates contour map of coherence versus interelectrode distance and frequency
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
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_contours(freqs,obs,array,coherencefname);
0002 %status =coherence_contours(freqs,obs,array,coherencefname);
0003 %
0004 %generates contour map of coherence versus interelectrode distance and frequency
0005 %freqs = frequencies to plot, e.g. [3:30] limits the plot to 3 to 30 Hz
0006 %obs = observations in the coherence file to plot (defaults to all)
0007 %array = either an array name,e.g., 'all','hemisphere','quadrant','frontback',
0008 %    or 'oned' or a list of channels
0009 %coherencefname = coherencefilename (can be gui by skipping this param)
0010 %
0011 
0012 if nargin < 4
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 
0039 if isempty(array)
0040     array = 'all';
0041 end
0042 if isempty(obs)
0043     obs = [1:nfiles];
0044 end;
0045 if isempty(freqs)
0046     freqs = [0:40];
0047 end;
0048 
0049 ch_pair_indices;
0050 coherencemax = 1;
0051 iline = 1;
0052 [xelec,yelec,zelec] = electrodes(129);
0053 twod_dist = real(twod_pos(xelec,yelec,zelec,9.2));
0054 if isstr(array)
0055     [arrayg,gnames] = arrays(array,[]);
0056 else
0057     arrayg = array;
0058 end
0059 for g = 1:size(arrayg,1)
0060     for io = 1:size(obs,2)
0061         figure
0062         [npairs, pairs, pairnames] = look_up_pairs(array,g,bad_chan,obs(io));
0063         version = fread(fid,1,'int16');
0064         [nfiles,obs_labels,Epoch,Window_Length,NEpoch,Nbad_chan,bad_chan,ref_flag,reference,NChan,NFreq] = rd_anal_hdr(fid);
0065         coherence_array = real(get_eeg_coherence(fid,freqs,obs(io),nfiles,NChan,NFreq,Epoch));          
0066         distance = [0:1:fix(max(twod_dist(pairs)))];                              
0067         coh_fit = zeros(size(freqs,2),size(distance,2));
0068         for j = 1:size(freqs,2)        
0069 
0070             p_coh = polyfit(twod_dist(pairs),coherence_array(j,pairs),4);
0071             coh_fit(j,:) = real(polyval(p_coh,distance));    
0072         end;        
0073         distance = [0:1:fix(max(twod_dist(pairs)))];
0074         hottie = hot;
0075         hotties = hottie(33:64,:);
0076         colormap(hotties);
0077         contourf(distance,freqs,coh_fit,[1:-0.1:0.1]),colorbar
0078         hold on, contour(distance,freqs,coh_fit,[0.1:0.1:0.2],'w--')
0079         hold on, contour(distance,freqs,coh_fit,[0.3:0.1:1],'k-')
0080         axis([0 max(twod_dist(pairs)) 0 max(freqs)]);
0081         ylabel('Frequency(Hz)')
0082         xlabel('Interelectrode Distance (cm)')
0083         title(['Coherence versus Distance and Frequency: '  deblank(setstr(obs_labels(obs(io),:))) ' ' pairnames]);
0084     end
0085 end
0086 
0087 
0088 
0089 
0090 
0091 
0092 
0093 
0094 
0095 
0096 
0097 
0098 
0099 
0100 
0101 
0102 
0103 
0104 
0105 
0106 
0107 
0108 
0109 
0110 
0111 
0112 
0113 
0114

Generated on Sun 24-Mar-2019 04:00:51 by m2html © 2003