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Dear Vanessa,
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<div>I don’t know the structure of your trigger sequence, but the error that you get suggests, that the logic that you use in trialfun_orientation_trigger is never fulfilled. </div>
<div>specifically, the line ‘if trg1==10 && trg2==50, does never yield a ’true’ value, so not trials are defined.</div>
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<div>Do you know how to use the matlab debugger? If not, please look it up on google, and specify a breakpoint in your code where you define the value variable. As a side note ( I am not sure) should this line not read strcmp({event.type},’trigger’), rather
than strcmp(’trigger’,{event.type}) ?</div>
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<div>Once you have the debugger switched on, you can explore the execution of your code line by line. Specifically, you could explore the sequence of trigger values, which - according to your code - apparently assumes that a trigger with value ’10’ will be
followed by a ’50’, not as the next value, but as the second trigger down the line.</div>
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<div>Good luck,</div>
<div>Jan-Mathijs</div>
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<div>On 20 Jun 2024, at 00:28, Vanessa Oluwato Ayo-Jibunoh via fieldtrip <fieldtrip@science.ru.nl> wrote:</div>
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Good evening,</div>
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Hope your day is going well.</div>
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My name is Vanessa Ayo- Jibunoh and I am working in the Perception Lab at the CUNY Graduate Center in New York city on Ensemble Perception. I am currently analyzing data for this project, where we recorded using EEG.</div>
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I'm reaching out because I keep getting this error message "Error using ft_definetrial (line 209)<br>
no trials were defined, see FT_DEFINETRIAL for help" when I try to define my trials.</div>
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I'm working with a .set datafile from EEGlab and I'm trying to separate my EEG data by trials using the ft_definetrail function. </div>
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Provided below are the cfg details I'm working with.</div>
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cfg =</div>
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struct with fields:</div>
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datafile: 'Acquisition 09.set'</div>
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trialfun: 'trialfun_orientation_trigger'</div>
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trialdef: [1×1 struct]</div>
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And, as it is an EEG datafile, this is the event structure.</div>
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event =</div>
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1×1798 struct array with fields:</div>
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type</div>
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value</div>
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sample</div>
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offset</div>
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duration</div>
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urevent</div>
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I have written the code for the "trialfun" function that precedes the ft_definetrialfunction and it seems to be written just fine and according to the code provided by this link on the fieldtrip website itself "<a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.fieldtriptoolbox.org%2Fexample%2Ftrialfun%2F&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C128310d49f6744003a2508dc92f4558d%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C638546825310550699%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=rpi6ZL3oHTVF%2FUz4UHVY%2FDreNaxGobEcObmvoyzrJfA%3D&reserved=0" originalsrc="https://www.fieldtriptoolbox.org/example/trialfun/" shash="Fx5IhdZ++CoogCwFT8xguDFcBCC60E+iz48EUkjrFg9ZxBmfF14ajI8CNAPhG4xFsUnefNgFbcM/90p/pbUwucT1QyKje+jZlI32anPl2qYHJy/Hu1ZvVsA6WenRyurPQ+sX4n6UY2sDyKVGrz4pHjrjt8t25HPGKbqEaX45ZN8=" originalsrc="https://www.fieldtriptoolbox.org/example/trialfun/" shash="yx/soWBDOe0sV4i/ojjcqkrEeZGiDjJqa0vNGIRgMJTqBosexXMNNnlnv6Biy2jbgvhE+tBejqdhzzRdNwapPcTaJMewPoDZvQDtULsDtxm7D8h0lbLGJigSPeqX1za4ItYTwNB8zf7tGjMzI5YViAbhsz40ocwy3kwCTSvHllY=" id="OWA16fc12ae-0c2e-0181-5792-f06efcfedfa7" class="OWAAutoLink">Making
your own trialfun for conditional trial definition - FieldTrip toolbox</a>" . This is the code;</div>
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function [trl, event] = trialfun_orientation_trigger(cfg);</div>
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cfg.dataset = 'Acquisition 09.set'</div>
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cfg.trialdef.prestim = 0.5</div>
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cfg.trialdef.poststim = 1</div>
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hdr = ft_read_header(cfg.dataset)</div>
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event = ft_read_event (cfg.dataset)</div>
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value = [event(find(strcmp('trigger', {event.type}))).value]'</div>
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sample = [event(find(strcmp('trigger', {event.type}))).sample]'</div>
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pretrig = -round(cfg.trialdef.prestim * hdr.Fs)</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
posttrig = round(cfg.trialdef.poststim * hdr.Fs)</div>
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trl = []</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
for j = 1:(length(value)-1)</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
trg1 = value(j);</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
trg2 = value (j+2);</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
if trg1==10 && trg2==50</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
trlbegin = sample(j) + pretrig;</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
trlend = sample(j) + posttrig;</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
offset = pretrig;</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
newtrl = [trlbegin trlend offset];</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
trl = [trl; newtrl];</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
end</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
end</div>
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end</div>
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However, when I plug this function into another code to define the trial, it gives me the error "Error using ft_definetrial (line 209) no trials were defined, see FT_DEFINETRIAL for help". </div>
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I will also provide the final code that is giving me a problem below</div>
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<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
cfg = []</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
cfg.datafile = 'Acquisition 09.set' ;</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
cfg.trialfun = 'trialfun_orientation_trigger';</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
cfg.trialdef.eventtype = 'trigger';</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
cfg.trialdef.eventvalue = [0 10 20];</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
cfg.trialdef.prestim = .5;</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
cfg.trialdef.poststim = 1;</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
ft_definetrial(cfg);</div>
</div>
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I'm not sure if it is a syntax error or I would have to write another code separately to define the 'trigger' in the event type as well to get the ft_definetrial function to work. I would like assistance from someone who is better experienced with this please.</div>
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Thank you,</div>
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God bless you.</div>
<span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; 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;">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; 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;">
<span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; 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;">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: 400; 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;">
<a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.science.ru.nl%2Fmailman%2Flistinfo%2Ffieldtrip&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C128310d49f6744003a2508dc92f4558d%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C638546825310550699%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=P1Ls%2FecdDv20r89Tbs1HQybEKP8VkYI78sfnnzQKkr4%3D&reserved=0" originalsrc="https://mailman.science.ru.nl/mailman/listinfo/fieldtrip" shash="YmBsYSoeJ8Xv7wbET31CyahcG1Q5ALiurMLHWmNEksQD3NQrqqUOtLnCjtE34f6VSIUMI+Dez9Zmsb83rZfsH/KIIA4GTqcce/w4VsZTZTnoaf+wlRZkvvTFpmL1nrS5YNSHRF+d24UGDnXeIUa39NBoGpE1otM2gTWk498c9n8=" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">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: 400; 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;">
<a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10.1371%2Fjournal.pcbi.1002202&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C128310d49f6744003a2508dc92f4558d%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C638546825310550699%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=D7KRVWhbVuN6Db0VXALv73q%2B3m4XV9Mor%2FfnKAI46iI%3D&reserved=0" originalsrc="https://doi.org/10.1371/journal.pcbi.1002202" shash="oIFf/Wf7JuNMoclDNv5OjTNj55z+l+VXm+z+yLMx3IX4jxUn2jLpZ6n8YRhcFGgOoM12op0MYKX5t8RITe9l7llImTqXpZz5UPa2EqDDf9pn3mQ26pvHPMS8iWi+0G9r4+YpUdUVA0ntKWGBKX9+dKr7OmZoLLpKXQ07nC9/22s=" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">https://doi.org/10.1371/journal.pcbi.1002202</a></div>
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