nex_info

 nex_info(filename) -- read and display .nex file info

 [nvar, names, types] = nex_info(filename)

 INPUT:
   filename - if empty string, will use File Open dialog
 OUTPUT:
   nvar - number of variables in the file
   names - [nvar 64] array of variable names
   types - [1 nvar] array of variable types
           Interpretation of type values: 0-neuron, 1-event, 2-interval, 3-waveform, 
                        4-population vector, 5-continuous variable, 6 - marker

0001 function [nvar, names, types] = nex_info(filename)
0002 % nex_info(filename) -- read and display .nex file info
0003 %
0004 % [nvar, names, types] = nex_info(filename)
0005 %
0006 % INPUT:
0007 %   filename - if empty string, will use File Open dialog
0008 % OUTPUT:
0009 %   nvar - number of variables in the file
0010 %   names - [nvar 64] array of variable names
0011 %   types - [1 nvar] array of variable types
0012 %           Interpretation of type values: 0-neuron, 1-event, 2-interval, 3-waveform,
0013 %                        4-population vector, 5-continuous variable, 6 - marker
0014 
0015 if(nargin ~= 1)
0016    disp('1 input arguments are required')
0017    return
0018 end
0019 
0020 if(isempty(filename))
0021    [fname, pathname] = uigetfile('*.nex', 'Select a Nex file');
0022     filename = strcat(pathname, fname);
0023 end
0024 
0025 fid = fopen(filename, 'r');
0026 if(fid == -1)
0027     disp('cannot open file');
0028    return
0029 end
0030 
0031 disp(strcat('file = ', filename));
0032 magic = fread(fid, 1, 'int32');
0033 version = fread(fid, 1, 'int32');
0034 comment = fread(fid, 256, 'char');
0035 freq = fread(fid, 1, 'double');
0036 tbeg = fread(fid, 1, 'int32');
0037 tend = fread(fid, 1, 'int32');
0038 nvar = fread(fid, 1, 'int32');
0039 fseek(fid, 260, 'cof');
0040 disp(strcat('version = ', num2str(version)));
0041 disp(strcat('frequency = ', num2str(freq)));
0042 disp(strcat('duration (sec) = ', num2str((tend - tbeg)/freq)));
0043 disp(strcat('number of variables = ', num2str(nvar)));
0044 names = zeros(1, 64);
0045 types=zeros(nvar);
0046 for i=1:nvar
0047     types(i) = fread(fid, 1, 'int32');
0048     var_version = fread(fid, 1, 'int32');
0049     names(i, :) = fread(fid, [1 64], 'char');
0050     dummy = fread(fid, 128+8, 'char');
0051 end
0052 names = char(names);
0053 fclose(fid);