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Thank you for your answer.
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<div>I have found a solution with an order of 3</div>
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<div>Thank you for the help :)</div>
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<div>Emilie <br>
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<div>Le 24 août 2014 à 13:47, Roey Schurr <<a href="mailto:roeysc@gmail.com">roeysc@gmail.com</a>> a écrit :</div>
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<div dir="ltr">Dear Emilie,
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<div>Try reading this thread and see if it helps:</div>
<div><a href="http://mailman.science.ru.nl/pipermail/fieldtrip/2012-June/005360.html">http://mailman.science.ru.nl/pipermail/fieldtrip/2012-June/005360.html</a><br>
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<div>The bottom line is, if you want a low highpass filer, you need to change the order of the filter you're using.</div>
<div>In the example in the thread above, using a filter of order 5 helped <span style="">Philipp applying a 0.1 Hz highpass filter. So you could try using something like:</span></div>
<div>cfg.hpfiltord = 5;<span style=""><br>
</span></div>
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<div><span style="">Hope this helps!</span></div>
<div><span style="">Roey</span></div>
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<div class="gmail_quote">On Sun, Aug 24, 2014 at 1:49 PM, Caspar, Emilie <span dir="ltr">
<<a href="mailto:e.caspar@ucl.ac.uk" target="_blank">e.caspar@ucl.ac.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">Thank you for your answer. The complete error message I have is this one, but I'm not able to decrypt it.
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<div>Error using filter_with_correction (line 44)</div>
<div>Calculated filter coefficients have poles on or outside the unit circle and will not be stable. Try a higher cutoff</div>
<div>frequency or a different type/order of filter.</div>
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<div>Error in filter_with_correction (line 44)</div>
<div> error('Calculated filter coefficients have poles on or outside the unit circle and will not be stable. Try a</div>
<div> higher cutoff frequency or a different type/order of filter.');</div>
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<div>Error in ft_preproc_bandpassfilter (line 148)</div>
<div> filt = filter_with_correction(B,A,dat,dir);</div>
<div class="">
<div><br>
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<div>Error in preproc (line 299)</div>
<div>if strcmp(cfg.bpfilter, 'yes'), dat = ft_preproc_bandpassfilter(dat, fsample, cfg.bpfreq, cfg.bpfiltord,</div>
<div>cfg.bpfilttype, cfg.bpfiltdir, cfg.bpinstabilityfix); end</div>
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<div>Error in ft_preprocessing (line 559)</div>
<div> [cutdat{i}, label, time{i}, cfg] = preproc(dat, hdr.label(rawindx), tim, cfg, begpadding, endpadding);</div>
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<div>Error in preprocessing_Libet (line 70)</div>
<div> allData_prepross = ft_preprocessing(cfg);</div>
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<div>It only occurs when I ask for a bpfilterrange from .1 to 30, or any values lower than .9.</div>
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<div>Thanks!</div>
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<div>Emilie</div>
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<div>Le 11 août 2014 à 12:43, Eelke Spaak <<a href="mailto:eelke.spaak@donders.ru.nl" target="_blank">eelke.spaak@donders.ru.nl</a>> a écrit :</div>
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<div class="h5"><br>
<blockquote type="cite">Dear Emilie,<br>
<br>
The error message you include only specifies *where* in the code the<br>
error happened, not *what* the actual error was. Could you include the<br>
actual error as well? Perhaps someone can then help you fix it. (In<br>
general there is no fixed lower limit on filter low-/highpass<br>
frequency, although a practical limit could depend on your data.)<br>
<br>
Best,<br>
Eelke<br>
<br>
On 9 August 2014 09:31, Caspar, Emilie <<a href="mailto:e.caspar@ucl.ac.uk" target="_blank">e.caspar@ucl.ac.uk</a>> wrote:<br>
<blockquote type="cite">Dear Fieldtrip members,<br>
<br>
I would like to apply to my data a bandpass filter from 0.016 (or at least<br>
0.1) to 30 Hz<br>
<br>
bpfilterRange = [.1 30];<br>
<br>
However, it seems that Fieltrip doesn't accept small high-pass filter<br>
values. I have the following mistake :<br>
<br>
<br>
Error in preproc (line 299)<br>
if strcmp(cfg.bpfilter, 'yes'), dat = ft_preproc_bandpassfilter(dat,<br>
fsample, cfg.bpfreq, cfg.bpfiltord,<br>
cfg.bpfilttype, cfg.bpfiltdir, cfg.bpinstabilityfix); end<br>
<br>
Error in ft_preprocessing (line 559)<br>
[cutdat{i}, label, time{i}, cfg] = preproc(dat, hdr.label(rawindx),<br>
tim, cfg, begpadding, endpadding);<br>
<br>
Error in preprocessing_Libet (line 70)<br>
allData_prepross = ft_preprocessing(cfg);<br>
<br>
I also tried with 0.2, 0.5, and the minimum acceptable I found was 0.9,<br>
which is quite high.<br>
<br>
I wonder if the problem comes from my data (but I had no problems on others<br>
programs) or if there is a way to apply 0.1 high-pass filter on Fieldtrip?<br>
<br>
Thank in advance,<br>
<br>
Emilie<br>
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