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<!-- ../../menu.html chronux_2_10 --><!-- ../menu.html dataio --><!-- menu.html HowToReadNexFilesInMatlab -->
<h1>nex_cont
</h1>

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="box"><strong>nex_cont(filename, varname): Read continuous variable from a .nex file</strong></div>

<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="box"><strong>function [adfreq, n, ts, fn, d] = nex_cont(filename, varname) </strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="fragment"><pre class="comment"> nex_cont(filename, varname): Read continuous variable from a .nex file

 [adfreq, n, ts, fn, d] = nex_cont(filename, varname)

 INPUT:
   filename - if empty string, will use File Open dialog
   varname - variable name

           continuous (a/d) data come in fragments. Each fragment has a timestamp
           and a number of a/d data points. The timestamp corresponds to
           the time of recording of the first a/d value in this fragment.
           All the data values stored in the vector d. 
 OUTPUT:
   n - total number of data points 
   ts - array of fragment timestamps (one timestamp for fragment, in seconds)
   fn - number of data points in each fragment
   d - array of a/d values (in millivolts)</pre></div>

<!-- crossreference -->
<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
This function calls:
<ul style="list-style-image:url(../../../matlabicon.gif)">
</ul>
This function is called by:
<ul style="list-style-image:url(../../../matlabicon.gif)">
<li><a href="test_nex.html" class="code" title="">test_nex</a>	</li></ul>
<!-- crossreference -->


<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function [adfreq, n, ts, fn, d] = nex_cont(filename, varname)</a>
0002 <span class="comment">% nex_cont(filename, varname): Read continuous variable from a .nex file</span>
0003 <span class="comment">%</span>
0004 <span class="comment">% [adfreq, n, ts, fn, d] = nex_cont(filename, varname)</span>
0005 <span class="comment">%</span>
0006 <span class="comment">% INPUT:</span>
0007 <span class="comment">%   filename - if empty string, will use File Open dialog</span>
0008 <span class="comment">%   varname - variable name</span>
0009 <span class="comment">%</span>
0010 <span class="comment">%           continuous (a/d) data come in fragments. Each fragment has a timestamp</span>
0011 <span class="comment">%           and a number of a/d data points. The timestamp corresponds to</span>
0012 <span class="comment">%           the time of recording of the first a/d value in this fragment.</span>
0013 <span class="comment">%           All the data values stored in the vector d.</span>
0014 <span class="comment">% OUTPUT:</span>
0015 <span class="comment">%   n - total number of data points</span>
0016 <span class="comment">%   ts - array of fragment timestamps (one timestamp for fragment, in seconds)</span>
0017 <span class="comment">%   fn - number of data points in each fragment</span>
0018 <span class="comment">%   d - array of a/d values (in millivolts)</span>
0019 
0020 n = 0;
0021 adfreq = 0;
0022 ts = 0;
0023 fn = 0;
0024 d = 0;
0025 
0026 <span class="keyword">if</span>(nargin ~= 2)
0027    disp(<span class="string">'2 input arguments are required'</span>)
0028    <span class="keyword">return</span>
0029 <span class="keyword">end</span>
0030 
0031 <span class="keyword">if</span>(ischar(filename) == 0)
0032    disp(<span class="string">'input arguments should be character arrays'</span>)
0033    <span class="keyword">return</span>
0034 <span class="keyword">end</span>
0035 
0036 <span class="keyword">if</span>(ischar(varname) == 0)
0037    disp(<span class="string">'input arguments should be character arrays'</span>)
0038    <span class="keyword">return</span>
0039 <span class="keyword">end</span>
0040 
0041 <span class="keyword">if</span>(isempty(filename))
0042    [fname, pathname] = uigetfile(<span class="string">'*.nex'</span>, <span class="string">'Select a Nex file'</span>);
0043     filename = strcat(pathname, fname);
0044 <span class="keyword">end</span>
0045 
0046 fid = fopen(filename, <span class="string">'r'</span>);
0047 <span class="keyword">if</span>(fid == 0)
0048    <span class="keyword">return</span>
0049 <span class="keyword">end</span>
0050 
0051 disp(strcat(<span class="string">'file = '</span>, filename));
0052 magic = fread(fid, 1, <span class="string">'int32'</span>);
0053 version = fread(fid, 1, <span class="string">'int32'</span>);
0054 comment = fread(fid, 256, <span class="string">'char'</span>);
0055 freq = fread(fid, 1, <span class="string">'double'</span>);
0056 tbeg = fread(fid, 1, <span class="string">'int32'</span>);
0057 tend = fread(fid, 1, <span class="string">'int32'</span>);
0058 nvar = fread(fid, 1, <span class="string">'int32'</span>);
0059 fseek(fid, 260, <span class="string">'cof'</span>);
0060 name = zeros(1, 64);
0061 found = 0;
0062 <span class="keyword">for</span> i=1:nvar
0063     type = fread(fid, 1, <span class="string">'int32'</span>);
0064     var_version = fread(fid, 1, <span class="string">'int32'</span>);
0065     name = fread(fid, [1 64], <span class="string">'char'</span>);
0066     offset = fread(fid, 1, <span class="string">'int32'</span>);
0067     nf = fread(fid, 1, <span class="string">'int32'</span>);
0068     dummy = fread(fid, 32, <span class="string">'char'</span>);
0069     adfreq = fread(fid, 1, <span class="string">'double'</span>);
0070     adtomv = fread(fid, 1, <span class="string">'double'</span>);
0071     n = fread(fid, 1, <span class="string">'int32'</span>);
0072     name = char(name);
0073     name = deblank(name);
0074     k = strcmp(name, deblank(varname));
0075     <span class="keyword">if</span>(k == 1)
0076         <span class="keyword">if</span> type ~= 5
0077             disp(sprintf(<span class="string">'%s is not a continuous variable'</span>, deblank(varname)));
0078             <span class="keyword">return</span>;
0079         <span class="keyword">end</span>
0080         found = 1;
0081         fseek(fid, offset, <span class="string">'bof'</span>);
0082         ts = fread(fid, [1 nf], <span class="string">'int32'</span>);
0083         fn = fread(fid, [1 nf], <span class="string">'int32'</span>);
0084         d = fread(fid, [1 n], <span class="string">'int16'</span>);
0085         <span class="keyword">break</span>
0086     <span class="keyword">end</span>
0087     dummy = fread(fid, 76, <span class="string">'char'</span>);
0088 <span class="keyword">end</span>
0089 
0090 fclose(fid);
0091 
0092 <span class="keyword">if</span> found == 0
0093     disp(<span class="string">'did not find variable in the file'</span>);
0094 <span class="keyword">else</span>
0095     ts = ts/freq;
0096     d = d*adtomv;
0097     fn(nf+1) = n;
0098     fn = diff(fn);
0099     disp(strcat(<span class="string">'number of data points = '</span>, num2str(n)));
0100 <span class="keyword">end</span></pre></div>
<hr><address>Generated on Fri 12-Aug-2011 11:36:15 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/" target="_parent">m2html</a></strong> &copy; 2005</address>
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