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<!-- ../../menu.html chronux_2_10 --><!-- ../menu.html dataio --><!-- menu.html ReadingPLXandDDTfilesinMatlab -->
<h1>plx_ts
</h1>

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="box"><strong>plx_ts(filename, channel, unit): Read spike timestamps from a .plx 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 [n, ts] = plx_ts(filename, ch, u) </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"> plx_ts(filename, channel, unit): Read spike timestamps from a .plx file

 [n, ts] = plx_ts(filename, channel, unit)

 INPUT:
   filename - if empty string, will use File Open dialog
   channel - 1-based channel number
   unit  - unit number (0- invalid, 1-4 valid)
 OUTPUT:
   n - number of timestamps
   ts - array of timestamps (in seconds)</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)">
</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 [n, ts] = plx_ts(filename, ch, u)</a>
0002 <span class="comment">% plx_ts(filename, channel, unit): Read spike timestamps from a .plx file</span>
0003 <span class="comment">%</span>
0004 <span class="comment">% [n, ts] = plx_ts(filename, channel, unit)</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">%   channel - 1-based channel number</span>
0009 <span class="comment">%   unit  - unit number (0- invalid, 1-4 valid)</span>
0010 <span class="comment">% OUTPUT:</span>
0011 <span class="comment">%   n - number of timestamps</span>
0012 <span class="comment">%   ts - array of timestamps (in seconds)</span>
0013 
0014 <span class="keyword">if</span>(nargin ~= 3)
0015    disp(<span class="string">'3 input arguments are required'</span>)
0016    <span class="keyword">return</span>
0017 <span class="keyword">end</span>
0018 
0019 n = 0;
0020 ts = 0;
0021 <span class="keyword">if</span>(isempty(filename))
0022    [fname, pathname] = uigetfile(<span class="string">'*.plx'</span>, <span class="string">'Select a plx file'</span>);
0023     filename = strcat(pathname, fname);
0024 <span class="keyword">end</span>
0025 
0026 fid = fopen(filename, <span class="string">'r'</span>);
0027 <span class="keyword">if</span>(fid == -1)
0028     disp(<span class="string">'cannot open file'</span>);
0029    <span class="keyword">return</span>
0030 <span class="keyword">end</span>
0031 
0032 disp(strcat(<span class="string">'file = '</span>, filename));
0033 
0034 <span class="comment">% read file header</span>
0035 header = fread(fid, 64, <span class="string">'int32'</span>);
0036 freq = header(35);  <span class="comment">% frequency</span>
0037 ndsp = header(36);  <span class="comment">% number of dsp channels</span>
0038 nevents = header(37); <span class="comment">% number of external events</span>
0039 nslow = header(38);  <span class="comment">% number of slow channels</span>
0040 npw = header(39);  <span class="comment">% number of points in wave</span>
0041 npr = header(40);  <span class="comment">% number of points before threshold</span>
0042 tscounts = fread(fid, [5, 130], <span class="string">'int32'</span>);
0043 wfcounts = fread(fid, [5, 130], <span class="string">'int32'</span>);
0044 evcounts = fread(fid, [1, 512], <span class="string">'int32'</span>);
0045 
0046 <span class="comment">% skip variable headers</span>
0047 fseek(fid, 1020*ndsp + 296*nevents + 296*nslow, <span class="string">'cof'</span>);
0048 
0049 <span class="comment">% read the data</span>
0050 record = 0;
0051 <span class="keyword">while</span> feof(fid) == 0
0052     type = fread(fid, 1, <span class="string">'int16'</span>);
0053     upperbyte = fread(fid, 1, <span class="string">'int16'</span>);
0054     timestamp = fread(fid, 1, <span class="string">'int32'</span>);
0055     channel = fread(fid, 1, <span class="string">'int16'</span>);
0056     unit = fread(fid, 1, <span class="string">'int16'</span>);
0057     nwf = fread(fid, 1, <span class="string">'int16'</span>);
0058     nwords = fread(fid, 1, <span class="string">'int16'</span>);
0059     toread = nwords;
0060     <span class="keyword">if</span> toread &gt; 0
0061       wf = fread(fid, toread, <span class="string">'int16'</span>);
0062     <span class="keyword">end</span>
0063        <span class="keyword">if</span> type == 1
0064          <span class="keyword">if</span> channel == ch 
0065             <span class="keyword">if</span> unit == u
0066                  n = n + 1;
0067                  ts(n) = timestamp/freq;
0068             <span class="keyword">end</span>
0069            <span class="keyword">end</span>
0070        <span class="keyword">end</span>
0071    
0072    record = record + 1;
0073    <span class="keyword">if</span> feof(fid) == 1
0074       <span class="keyword">break</span>
0075    <span class="keyword">end</span>
0076    
0077 <span class="keyword">end</span>
0078 disp(strcat(<span class="string">'number of timestamps = '</span>, num2str(n)));
0079 
0080 fclose(fid);</pre></div>
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