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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>
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- <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)">
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- <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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