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Hi Masoud,
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<div class="">I suggest to do the following (if you haven’t done so already):</div>
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<div class="">1) check the documentation of ft_mvaranalysis, and look for the parameters that you can specify: the cfg you pasted in your e-mail looks a bit random, and does not contain options that I would have expected (and contains options that I would not
have expected). e.g. you don’t specify the parameter ‘order’, and you specify the cfg.method to be ‘granger’. </div>
<div class="">2) check in the matlab documentation what the error means -> it suggests a low-level problem with the numerics of your input data.</div>
<div class="">3) put a breakpoint in your code, so that you can inspect in detail what is happening with the input data step-by-step.</div>
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<div class="">Best wishes,</div>
<div class="">Jan-Mathijs</div>
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<div class="">On 10 Dec 2022, at 15:56, masoud via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
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<div dir="auto" class="">Hello dear fieldtrip community
<div dir="auto" class="">I have been using fieldtrip for quite awhile now and now I am dealing with mvar analysis, I preprocessed the data and now I am doing it's multivariate autoregressive Analysis, and also i have read the document of the function.</div>
<div dir="auto" class="">here is my code:</div>
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<div dir="auto" class=""><span style="font-size:12.8px" class="">cfg = [];</span><br style="font-size:12.8px" class="">
<span style="font-size:12.8px" class="">load('1-1alpha.mat')</span><br style="font-size:12.8px" class="">
<span style="font-size:12.8px" class="">load('toi.mat')</span><br style="font-size:12.8px" class="">
<span style="font-size:12.8px" class="">cfg.method = 'granger';</span><br style="font-size:12.8px" class="">
<span style="font-size:12.8px" class="">cfg.trials = 'all';</span><br style="font-size:12.8px" class="">
<span style="font-size:12.8px" class="">cfg.method = 'bsmart';</span><br style="font-size:12.8px" class="">
<span style="font-size:12.8px" class="">cfg.t_ftimwin = 5;</span><br style="font-size:12.8px" class="">
<span style="font-size:12.8px" class="">cfg.toi = toi;</span><br style="font-size:12.8px" class="">
<span style="font-size:12.8px" class="">cfg.output = 'parameters';</span><br style="font-size:12.8px" class="">
<span style="font-size:12.8px" class="">mvardata = ft_mvaranalysis(cfg, data);</span><br class="">
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<div dir="auto" class=""><span style="font-size:12.8px" class="">And the error is:</span></div>
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<div dir="ltr" class="">Error using chol<br class="">
Matrix must be positive definite.<br class="">
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Error in armorf (line 40)<br class="">
ap(:,:,1) = inv((chol(ap(:,:,1)/Nr*(Nl-1)))');<br class="">
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Error in ft_mvaranalysis (line 488)<br class="">
[ar, tmpnoisecov] = armorf(dat, numel(rpt{rlop}), size(tmpdata.trial{1},2), cfg.order);<br class="">
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Error in Untitled6 (line 13)<br class="">
mvardata = ft_mvaranalysis(cfg, data);<br class="">
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<div dir="auto" class=""><span style="font-size:12.8px" class="">I would very much appreciate it if anyone can help me solve this problem</span></div>
<div dir="auto" class=""><span style="font-size:12.8px" class="">Best regards </span></div>
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