Home > eeg > egis > scripts > image_eeg_power.m

image_eeg_power

PURPOSE ^

status = = image_eeg_power(freqs,dimen,obs,paging,plot_res,power_type,powerfname,output_name);

SYNOPSIS ^

function export_matrix = image_eeg_power(freqs,dimen,obs,paging,plot_res,power_type,powerfname,output_name);

DESCRIPTION ^

status = = image_eeg_power(freqs,dimen,obs,paging,plot_res,power_type,powerfname,output_name);

freqs = frequencies to plot, e.g. [3:7 10] is 3 4 5 6 and 7 and 10 
 [3:0.5:5] is 3 , 3.5 4,4.5,5, default is 5:1:20 
dimen = dimensions of image e.g., [2 3] default is [sqrt(size(freqs,2)] sqrt(size(freqs,2) 
obs = observations (default is all)
paging = 'byobs' or 'cross' default is 'byobs', cross means frequencies
    are columns and observations are rows. 
    if 'cross' is selected the output is 
    image.o (observation nums) .f (freqs).img
    if 'byobs' is selected the output is 
    obs_label.f (freqs) .img
plot_res = plot resolution e.g., 80 default is 50
power_type = 'power' or 'amplitude' (default)
powerfname = powerfilename (can be gui by skipping or passing a blank)
output_name = root name of output file, defaults to gui

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function export_matrix = image_eeg_power(freqs,dimen,obs,paging,plot_res,power_type,powerfname,output_name);
0002 %status = = image_eeg_power(freqs,dimen,obs,paging,plot_res,power_type,powerfname,output_name);
0003 %
0004 %freqs = frequencies to plot, e.g. [3:7 10] is 3 4 5 6 and 7 and 10
0005 % [3:0.5:5] is 3 , 3.5 4,4.5,5, default is 5:1:20
0006 %dimen = dimensions of image e.g., [2 3] default is [sqrt(size(freqs,2)] sqrt(size(freqs,2)
0007 %obs = observations (default is all)
0008 %paging = 'byobs' or 'cross' default is 'byobs', cross means frequencies
0009 %    are columns and observations are rows.
0010 %    if 'cross' is selected the output is
0011 %    image.o (observation nums) .f (freqs).img
0012 %    if 'byobs' is selected the output is
0013 %    obs_label.f (freqs) .img
0014 %plot_res = plot resolution e.g., 80 default is 50
0015 %power_type = 'power' or 'amplitude' (default)
0016 %powerfname = powerfilename (can be gui by skipping or passing a blank)
0017 %output_name = root name of output file, defaults to gui
0018 if nargin < 7
0019     [fid, powerfname, pathname] = get_fid('rb');
0020     output_name = powerfname;
0021 elseif isempty(powerfname)
0022     [fid, powerfname, pathname] = get_fid('rb');
0023 else
0024     fid = fopen(powerfname,'rb');
0025     pathname = [];
0026 end;
0027 version = fread(fid,1,'int16');
0028 if version ~= -3
0029     error('this is not a power file');
0030 end;
0031  [nfiles,obs_labels,Epoch,Window_Length,NEpoch,Nbad_chan,bad_chan,ref_flag,reference,NChan,NFreq] = rd_anal_hdr(fid);
0032 if nargin == 0
0033     freqs = [5:1:20];
0034     obs = [1:nfiles];
0035     dimen = [sqrt(size(freqs,2)) sqrt(size(freqs,2))];
0036     paging = 'byobs';
0037     plot_res = 50;
0038     power_type = 'amplitude';
0039 end;
0040 if nargin == 1
0041     obs = [1:nfiles];
0042     dimen = [sqrt(size(freqs,2)) sqrt(size(freqs,2))];
0043     paging = 'byobs';
0044     plot_res = 50;
0045     power_type = 'amplitude';
0046 end;        
0047 if nargin == 2
0048     obs = [1:nfiles];
0049     paging = 'byobs';
0050     plot_res = 50;
0051     power_type = 'amplitude';
0052 end;    
0053 if nargin == 3
0054     paging = 'byobs';
0055     plot_res = 50;
0056     power_type = 'amplitude';
0057 end;
0058 if nargin == 4
0059     plot_res = 50;
0060     power_type = 'amplitude';
0061 end;
0062 if nargin == 5
0063     power_type = 'amplitude';
0064 end;
0065 if isempty(paging)
0066     paging = 'byobs';
0067 end
0068 if isempty(plot_res)
0069     plot_res = 50;
0070 end;
0071 if isempty(dimen)
0072     dimen = [sqrt(size(freqs,2)) sqrt(size(freqs,2))];
0073 end
0074 if isempty(obs)
0075     obs = [1:nfiles];
0076 end;
0077 if isempty(power_type)
0078     power_type = 'amplitude';
0079 end;
0080 if nargin < 8
0081     [outfid,output_name] = put_fid('wb')
0082     fclose(outfid);
0083 end
0084 if isempty(output_name)
0085     output_name = powerfname;
0086 end;
0087 obs_mask = zeros(1,nfiles);
0088 obs_mask(obs) = ones(1,size(obs,2));
0089 if strcmp(paging,'byobs')
0090     for i = 1:nfiles
0091         power = fread(fid,[NChan(i),NFreq(i)],'float');
0092         if obs_mask(i) > 0 
0093         power = power';
0094         if strcmp(power_type,'amplitude')
0095             power = sqrt(power);
0096         end;
0097         bins = freqs*Epoch(i) + ones(1,size(freqs,2));
0098         bchan = bad_chan(i,find(bad_chan(i,:)));
0099         imagename = [output_name '.f' int2str(freqs) '.pow'];
0100         export_matrix = make_a_image(power(bins,:),bchan,plot_res,dimen(1),dimen(2),imagename);
0101         end;
0102     end;
0103 elseif strcmp(paging,'list')
0104     if size(freqs,2) ~= size(obs,2)
0105         error('lists dont match');
0106     end;
0107     if isempty(dimen)
0108     dimen = [sqrt(size(freqs,2)) sqrt(size(freqs,2))];
0109     end;
0110     icount = 1;
0111     bchan = [];
0112     for i = 1:nfiles
0113         power = fread(fid,[NChan(i),NFreq(i)],'float');
0114         if obs_mask(i) > 0 
0115         power = power';
0116         if strcmp(power_type,'amplitude')
0117             power = sqrt(power);
0118         end;
0119         bin = freqs(icount)*Epoch(i) + 1;
0120         power_plot(icount,:) = power(bin,:);
0121         bchan = [bchan bad_chan(i,find(bad_chan(i,:)))];
0122         icount = icount + 1;    
0123         end;
0124     end;
0125         imagename = [output_name];
0126         export_matrix = make_a_image(power_plot,bchan,plot_res,dimen(1),dimen(2),imagename);
0127     
0128 elseif strcmp(paging,'cross') 
0129     image_binary = zeros(dimen(1)*plot_res,dimen(2)*plot_res);
0130     iff = 1;
0131     for i = 1:nfiles
0132         power = fread(fid,[NChan(i),NFreq(i)],'float');
0133         if obs_mask(i) > 0 
0134         power = power';
0135         if strcmp(power_type,'amplitude')
0136             power = sqrt(power);
0137         end;
0138         bins = freqs*Epoch(i) + ones(1,size(freqs,2));
0139         bchan = bad_chan(i,find(bad_chan(i,:)));
0140         imagename = [output_name '.' deblank(setstr(obs_labels(i,:))) '.f' int2str(freqs)];
0141         image_binary((iff-1)*plot_res+1:iff*plot_res,:) = make_a_image(power(bins,:),bchan,plot_res,1,size(bins,2),[]);
0142         iff = iff + 1;
0143         end;
0144     end;
0145     imagename = [output_name '.o_' int2str(obs) '.f_' int2str(freqs) '.pow.img'];
0146     ifid = fopen(imagename,'wb');
0147     if ifid < 0
0148         fclose('all');
0149         error('file open for image failed');
0150     end;
0151     num_written = fwrite(ifid, size(image_binary), 'float');
0152     if num_written ~= 2
0153             error('Failed to write header info');
0154     end 
0155     fwrite(ifid,plot_res,'float');
0156     export_matrix = image_binary;
0157     num_written = fwrite(ifid,image_binary','float');
0158     if num_written ~= size(image_binary,1)*size(image_binary,2)
0159         error('write-out failed')
0160     end;
0161 end;    
0162 status = 1;
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