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<font size="4" class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Dear Sarah,</font>
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<div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font size="4" class="">It is not clear what error message you get, nor why you think you should ft_timelockanalysis/ft_timelockgrandaverage/ft_topoplotER.</font></div>
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<div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font size="4" class="">Some pointers: </font></div>
<div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font size="4" class="">-For a mathematical operation to be applied to numeric data that resides within a fieldtrip-style data structure you’d use ft_math.</font></div>
<div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font size="4" class="">-What you want to do (i.e. adding or subtracting estimates of frequency specific power estimated for different frequency bins) probably requires some manual intervention
with the data, because FT will likely prevent you to do so, since it checks whether the frequency bins for the to-be-combined data structures match. I could type some recipe now, but since you are not too clear on the details so I’d rather not spend time on
that now. Also, I’d like to give other people the opportunity to chime in here :).</font></div>
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<div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font size="4" class="">Best wishes,</font></div>
<div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font size="4" class="">Jan-Mathijs</font></div>
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<div class="">On 11 May 2020, at 16:43, <a href="mailto:sarah.kirchler@gmail.com" class="">
sarah.kirchler@gmail.com</a> wrote:</div>
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Dear Fieldtrip Users,<span class="Apple-converted-space"> </span><br class="">
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thank you for all the help you’ve given me already.<span class="Apple-converted-space"> </span><br class="">
Now I am trying to make the sum and the difference of the Grand mean from/between two frequencies I measured with an EEG.<span class="Apple-converted-space"> </span><br class="">
I read that it is possible to make a datastructure using {} within ft_timelockbaseline and then use the option cfg.operation(x1-x2 and so on) as a operation of function ft_topoplotER to make this sum/these differences.<span class="Apple-converted-space"> </span><br class="">
Now my Problem is that I don’t need to make the baselinecorrection via ft_timelockbaseline because I don’t have the baseline in the datasegment I’m interested in. So I tried to build the datastructure for cfg.operation within ft_timelockanalysis but Fieldtrip
doesn’t allow this and I get an error message.<span class="Apple-converted-space"> </span><br class="">
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My questions are now:<span class="Apple-converted-space"> </span><br class="">
1. Can I make the difference also within the ft_timelockgrandavverage function or do I have to make the difference lawer in ft_topoplotER?<span class="Apple-converted-space"> </span><br class="">
2. If so, how can I or form a datastructure I can use in cfg.operation or make the difference differently with some other function?<br class="">
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I hope you understand me,<span class="Apple-converted-space"> </span><br class="">
to all you extraordinary brains: thank you in advance,<span class="Apple-converted-space"> </span><br class="">
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Sarah</div>
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<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://doi.org/10.1371/journal.pcbi.1002202" 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://doi.org/10.1371/journal.pcbi.1002202</a></div>
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