<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
Hi Eva,
<div class=""><br class="">
</div>
<div class="">Perhaps the following quote - from the help documentation of the read_edf.m function, which is in fieldtrip/fileio/private, and which is used under the hood by ft_read_header - may give you some ‘aanknopingspunten’: </div>
<div class=""><br class="">
</div>
<div class="">
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% READ_EDF reads specified samples from an EDF datafile. It neglects all trial or</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% data block boundaries as if the data was acquired in non-continuous mode.</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">%</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% Note that since FieldTrip only accommodates a single sampling rate in a given</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% dataset, whereas EDF allows specification of a sampling rate for each channel. If</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% there are heterogenous sampling rates then this function will automatically choose</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% a subset. If the last such channel is different from the rest, the assumption will</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% be made that it is the annotation channel and the rest will be selected. If that</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% is not the case, then the largest subset of channels with a consistent sampling</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% rate will be chosen. To avoid this automatic selection process, the user may</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% specify their own choice of channels using chanindx. In this case, the automatic</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% selection will only occur if the user selected channels still have heterogenous</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% sampling rates. In this case the automatic selection will occur amongst the user</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% specified channels. While reading the header the resulting channel selection</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% decision will be stored in hdr.orig.chansel and the contents of this field will</span></div>
<div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" class="">
<span style="font-variant-ligatures: no-common-ligatures" class="">% override chanindx during data reading.</span></div>
<div class=""><span style="font-variant-ligatures: no-common-ligatures" class=""><br class="">
</span></div>
<div class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Best wishes,</span></div>
<div class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Jan-Mathijs</span></div>
<div class=""><span style="font-variant-ligatures: no-common-ligatures" class=""><br class="">
</span></div>
<div><br class="">
<blockquote type="cite" class="">
<div class="">On 19 Oct 2021, at 10:06, Eva Schlösser via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-size: 12pt; font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols;" class="">
<div style="margin-top: 0px; margin-bottom: 0px;" class="">Dear all,</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">Hope you are doing okay. </div>
<div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">I'm making two script for selecting EEG or aEEG data. </div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">When I use the ft_read_header function for EEG data (edf file), my script is working and selecting all the right channels (because of the frequency of the EEG data is most common in the edf file). </div>
<div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">However, when I have the aEEG .edf file, hdr_read_header is taking the 1 [Hz] channels instead of the channels of the aEEG, because the 1 [Hz] is now more common in the edf. file, but those channels
I don't need!</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">I tried to use the edf2fieldtrip function, ft_channelselection and ft_selectdata.</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">Now it is possible to get the data for only the aEEG channels. However, I want to read this data with the ft_read_header function, so I can use the same hdr.Fs (for example) in my script.</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">Can somebody help me with this?<br class="">
<br class="">
Kind regards,</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">Eva </div>
</div>
<span id="cid:8B727F35-4912-4803-916C-57BA02B431E4"><hdr_read_header.txt></span><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">fieldtrip
mailing list</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<a href="https://mailman.science.ru.nl/mailman/listinfo/fieldtrip" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<a href="https://urldefense.com/v3/__https://doi.org/10.1371/journal.pcbi.1002202__;!!HJOPV4FYYWzcc1jazlU!offyjAwct_fSvMS6_c7A5F5Ahr6lp9sKbYcMFxRum_u-eLxv9HCRjbqfjCCIEBGl0kEAD-nawGnngUQ$" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://urldefense.com/v3/__https://doi.org/10.1371/journal.pcbi.1002202__;!!HJOPV4FYYWzcc1jazlU!offyjAwct_fSvMS6_c7A5F5Ahr6lp9sKbYcMFxRum_u-eLxv9HCRjbqfjCCIEBGl0kEAD-nawGnngUQ$</a><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""></span></div>
</blockquote>
</div>
<br class="">
</div>
</body>
</html>