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

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="box"><strong>plx_waves(filename, channel, unit): Read waveform data 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, npw, ts, wave] = plx_waves(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_waves(filename, channel, unit): Read waveform data from a .plx file

 [n, npw, ts, wave] = plx_waves(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 waveforms
   npw - number of points in each waveform
   ts - array of timestamps (in seconds) 
   wave - array of waveforms [npw, n], raw a/d values</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, npw, ts, wave] = plx_waves(filename, ch, u)</a>
0002 <span class="comment">% plx_waves(filename, channel, unit): Read waveform data from a .plx file</span>
0003 <span class="comment">%</span>
0004 <span class="comment">% [n, npw, ts, wave] = plx_waves(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 waveforms</span>
0012 <span class="comment">%   npw - number of points in each waveform</span>
0013 <span class="comment">%   ts - array of timestamps (in seconds)</span>
0014 <span class="comment">%   wave - array of waveforms [npw, n], raw a/d values</span>
0015 
0016 <span class="keyword">if</span>(nargin ~= 3)
0017    disp(<span class="string">'3 input arguments are required'</span>)
0018    <span class="keyword">return</span>
0019 <span class="keyword">end</span>
0020 
0021 n = 0;
0022 npw = 0;
0023 ts = 0;
0024 wave = 0;
0025 
0026 <span class="keyword">if</span>(isempty(filename))
0027    [fname, pathname] = uigetfile(<span class="string">'*.plx'</span>, <span class="string">'Select a plx file'</span>);
0028     filename = strcat(pathname, fname);
0029 <span class="keyword">end</span>
0030 
0031 fid = fopen(filename, <span class="string">'r'</span>);
0032 <span class="keyword">if</span>(fid == -1)
0033     disp(<span class="string">'cannot open file'</span>);
0034    <span class="keyword">return</span>
0035 <span class="keyword">end</span>
0036 
0037 disp(strcat(<span class="string">'file = '</span>, filename));
0038 
0039 <span class="comment">% read file header</span>
0040 header = fread(fid, 64, <span class="string">'int32'</span>);
0041 freq = header(35);  <span class="comment">% frequency</span>
0042 ndsp = header(36);  <span class="comment">% number of dsp channels</span>
0043 nevents = header(37); <span class="comment">% number of external events</span>
0044 nslow = header(38);  <span class="comment">% number of slow channels</span>
0045 npw = header(39);  <span class="comment">% number of points in wave</span>
0046 npr = header(40);  <span class="comment">% number of points before threshold</span>
0047 tscounts = fread(fid, [5, 130], <span class="string">'int32'</span>);
0048 wfcounts = fread(fid, [5, 130], <span class="string">'int32'</span>);
0049 evcounts = fread(fid, [1, 512], <span class="string">'int32'</span>);
0050 
0051 <span class="comment">% skip variable headers</span>
0052 fseek(fid, 1020*ndsp + 296*nevents + 296*nslow, <span class="string">'cof'</span>);
0053 
0054 record = 0;
0055 wave = zeros(npw, 1);
0056 wf = zeros(npw, 1);
0057 
0058 <span class="comment">% read data records</span>
0059 <span class="keyword">while</span> feof(fid) == 0
0060    type = fread(fid, 1, <span class="string">'int16'</span>);
0061     upperbyte = fread(fid, 1, <span class="string">'int16'</span>);
0062     timestamp = fread(fid, 1, <span class="string">'int32'</span>);
0063     channel = fread(fid, 1, <span class="string">'int16'</span>);
0064    unit = fread(fid, 1, <span class="string">'int16'</span>);
0065    nwf = fread(fid, 1, <span class="string">'int16'</span>);
0066    nwords = fread(fid, 1, <span class="string">'int16'</span>);
0067    toread = nwords;
0068    <span class="keyword">if</span> toread &gt; 0
0069       wf = fread(fid, [toread, 1], <span class="string">'int16'</span>);
0070    <span class="keyword">end</span>
0071    <span class="keyword">if</span> toread &gt; 0
0072        <span class="keyword">if</span> type == 1
0073          <span class="keyword">if</span> channel == ch 
0074             <span class="keyword">if</span> unit == u
0075             n = n + 1;
0076                ts(n) = timestamp/freq;
0077                wave(:, n) = wf;
0078             <span class="keyword">end</span>
0079            <span class="keyword">end</span>
0080        <span class="keyword">end</span>
0081    <span class="keyword">end</span>
0082    
0083    record = record + 1;
0084    <span class="keyword">if</span> feof(fid) == 1
0085       <span class="keyword">break</span>
0086    <span class="keyword">end</span>
0087    
0088 <span class="keyword">end</span>
0089 disp(strcat(<span class="string">'number of waveforms = '</span>, num2str(n)));
0090 
0091 fclose(fid);</pre></div>
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