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<p class="MsoNormal">Dear Community,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I have an issue with data size. I am processing high-density EEG data from a sleep study. Following preprocessing I perform time-frequency transformations and a baseline correction using the following code:
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> cfg = [];</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> cfg.method =
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'wavelet'</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black">;</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> cfg.output =
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'pow'</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black">;</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> cfg.keeptrials =
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'no'</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black">;</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> cfg.width = 3;
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:forestgreen">%
</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> cfg.foi = 1:1:16;
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:forestgreen">%
</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> cfg.toi = -0.7:0.2:0.9;
</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> freqanalysis_FV = ft_freqanalysis(cfg, data_FV);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> cfg = [];</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> cfg.baseline = [-0.6, 0];
</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> cfg.baselinetype =
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'relchange'</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black">;</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> ERDERS_FV = ft_freqbaseline(cfg, freqanalysis_FV)</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">As you can see, I do <b>not</b> keep the trials. Still, the size of ERDERS seems to depend on the size of data_FV. Why is that the case? Also, changing cfg.foi does not change the file size – why? The problem is that
this way the data can hardly be handled as it takes up so much RAM. Please note that I do clear everything from the workspace I do not need, that should not be the issue.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks a lot for your thoughts.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Christine<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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