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  <title>Description of ddt</title>
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<!-- ../../menu.html chronux_2_10 --><!-- ../menu.html dataio --><!-- menu.html ReadingPLXandDDTfilesinMatlab -->
<h1>ddt
</h1>

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="box"><strong>ddt(filename) Read data from a .ddt 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 [nch, npoints, freq, d] = ddt(filename) </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"> ddt(filename) Read data from a .ddt file

 [nch, npoints, freq, d] = ddt(filename)

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

 OUTPUT:
   nch - number of channels
   npoints - number of data points for each channel
   freq - A/D frequency
   d - [nch npoints] data array</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 [nch, npoints, freq, d] = ddt(filename)</a>
0002 <span class="comment">% ddt(filename) Read data from a .ddt file</span>
0003 <span class="comment">%</span>
0004 <span class="comment">% [nch, npoints, freq, d] = ddt(filename)</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">%</span>
0009 <span class="comment">% OUTPUT:</span>
0010 <span class="comment">%   nch - number of channels</span>
0011 <span class="comment">%   npoints - number of data points for each channel</span>
0012 <span class="comment">%   freq - A/D frequency</span>
0013 <span class="comment">%   d - [nch npoints] data array</span>
0014 
0015 <span class="keyword">if</span>(nargin ~= 1)
0016    disp(<span class="string">'1 input argument is required'</span>)
0017    <span class="keyword">return</span>
0018 <span class="keyword">end</span>
0019 nch = 0;
0020 npoints = 0;
0021 
0022 <span class="keyword">if</span>(isempty(filename))
0023    [fname, pathname] = uigetfile(<span class="string">'*.ddt'</span>, <span class="string">'Select a ddt file'</span>);
0024     filename = strcat(pathname, fname);
0025 <span class="keyword">end</span>
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 disp(strcat(<span class="string">'file = '</span>, filename));
0032 version = fread(fid, 1, <span class="string">'int32'</span>);
0033 dataoffset = fread(fid, 1, <span class="string">'int32'</span>);
0034 freq = fread(fid, 1, <span class="string">'double'</span>);
0035 nch = fread(fid, 1, <span class="string">'int32'</span>);
0036 
0037 fseek(fid, 0, 1);
0038 fsize = ftell(fid);
0039 frewind(fid);
0040 fseek(fid, dataoffset, 0);
0041 npoints = (fsize - dataoffset)/(nch*2);
0042 d = fread(fid, [nch npoints], <span class="string">'int16'</span>);
0043 
0044 fclose(fid);</pre></div>
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