<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">You might find my EP Toolkit to be useful for this. It can import EEGlab data files, generate difference waves, and plot them.<div><br></div><div><a href="https://sourceforge.net/projects/erppcatoolkit/">https://sourceforge.net/projects/erppcatoolkit/</a><br><div><br></div><div>Cheers!</div><div><br></div><div>Joe</div><div><br><div><div>On Sep 3, 2012, at 11:17 PM, Joshua Hartshorne <jkhartshorne@gmail.com> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">I have been trying to plot difference waves (well, really difference topoplots) in EEGLab. Since there didn't appear to be any way to actually do this, I thought I'd get around the problem by exporting the data, computing the condition averages, subtracting the one condition from the other, and then reimport in order to then plot.
<div><br></div><div>Unfortunately, importing has not bee working. I followed several examples in the wiki, including the one for Matlab arrays which gives and example involving made-up data (<a href="http://sccn.ucsd.edu/wiki/A01:_Importing_Continuous_and_Epoched_Data#Importing_a_Matlab_array">http://sccn.ucsd.edu/wiki/A01:_Importing_Continuous_and_Epoched_Data#Importing_a_Matlab_array</a>) but invariably get the following error:</div>
<div><br></div><div><div>eeg_checkset warning: 3rd dimension size of data (1) does not match the number of epochs (0), corrected</div><div>eeg_checkset warning: number of columns in data (25600) does not match the number of points (0): corrected</div>
<div>eeg_checkset note: upper time limit (xmax) adjusted so (xmax-xmin)*srate+1 = number of frames</div></div><div><br></div><div>When I plot the data, it ignores anything I told it about where the epoch starts (e.g., -0.2) and starts the epoch at 0 regardless. And when I edit channel info, it says there is only 1 channel, even though it's happy to plot all the channels. </div>
<div><br></div><div>Does anybody have any idea what might be happening?<br><br>Josh Hartshorne</div>
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"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Courier; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Courier; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div><div><br>--------------------------------------------------------------------------------</div><div><br></div><div>Joseph Dien,</div><div>Senior Research Scientist</div><div>University of Maryland </div><div><br></div><div>E-mail: jdien07@mac.com</div><div>Phone: 301-226-8848</div><div>Fax: 301-226-8811</div><div>http://joedien.com//</div></div><br></div><div><br></div><div><br></div><br></div></span></div></span></div></span></div></span></div></span></div></span></div></span><br class="Apple-interchange-newline"></div></span><br class="Apple-interchange-newline"></div></span><br class="Apple-interchange-newline"></div></span><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline">
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