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<div class="">Hello fellow FieldTrip'er:</div>
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>Can someone help me understand and hopefully fix the following runtime error message I am seeing (I searched a bit on the website documentation but didn’t find anything):</div>
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Error using filter_with_correction (line 51)</div>
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Calculated filter coefficients have poles on or outside the unit circle and</div>
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will not be stable. Try a higher cutoff frequency or a different type/order of</div>
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filter.</div>
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Error in filter_with_correction (line 51)</div>
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error('Calculated filter coefficients have poles on or outside the unit</div>
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circle and will not be stable. Try a higher cutoff frequency or a different</div>
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type/order of filter.');</div>
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Error in ft_preproc_bandpassfilter (line 286)</div>
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filt = filter_with_correction(B,A,dat,dir,usefftfilt);</div>
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Error in preproc (line 324)</div>
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if strcmp(cfg.bpfilter, 'yes'), dat = ft_preproc_bandpassfilter(dat,</div>
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fsample, cfg.bpfreq, cfg.bpfiltord, cfg.bpfilttype, cfg.bpfiltdir,</div>
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cfg.bpinstabilityfix, cfg.bpfiltdf, cfg.bpfiltwintype, cfg.bpfiltdev,</div>
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cfg.plotfiltresp, cfg.usefftfilt); end</div>
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Error in ft_preprocessing (line 592)</div>
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[cutdat{i}, label, time{i}, cfg] = preproc(dat, hdr.label(rawindx), tim,</div>
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cfg, begpadding, endpadding);</div>
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Error in test (line 25)</div>
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data = ft_preprocessing ( cfg );</div>
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Error in run (line 96)</div>
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evalin('caller', [script ';']);</div>
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>Here is my script:</div>
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addpath <span style="font-variant-ligatures: no-common-ligatures; color: #b6660a" class="">
/</span>path/to/my<span style="font-variant-ligatures: no-common-ligatures; color: #b6660a" class="">/</span>fieldtrip</div>
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ft_defaults</div>
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<div style="margin: 0px; font-family: 'Andale Mono'; color: rgb(67, 41, 212); background-color: rgb(223, 219, 196);" class="">
% 1. MEG</div>
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<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class="">disp (
</span>'Reading 1.fif...'<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class=""> )</span></div>
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cfg = <span style="font-variant-ligatures: no-common-ligatures; color: #01a3af" class="">
[]</span><span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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cfg.dataset = <span style="font-variant-ligatures: no-common-ligatures; color: #b12512" class="">
'1.fif'</span><span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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data = ft_preprocessing ( cfg )<span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class="">disp (
</span>'Getting MEG channel 1...'<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class=""> )</span></div>
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meg_channel = ft_channelselection ( <span style="font-variant-ligatures: no-common-ligatures; color: #b12512" class="">
'MEG0111'</span>, data.label )<span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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cfg = <span style="font-variant-ligatures: no-common-ligatures; color: #01a3af" class="">
[]</span><span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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cfg.channel = meg_channel<span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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meg = ft_selectdata ( cfg, data )<span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class="">disp (
</span>'Saving meg...'<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class=""> )</span></div>
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save meg.mat meg <span style="font-variant-ligatures: no-common-ligatures; color: #b6660a" class="">
-</span>v7<span style="font-variant-ligatures: no-common-ligatures; color: #b12512" class="">.3</span><span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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clearvars cfg meg<span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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% 2. Low delta MEG</div>
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<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class="">disp (
</span>'Low delta MEG...'<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class=""> )</span></div>
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cfg = <span style="font-variant-ligatures: no-common-ligatures; color: #01a3af" class="">
[]</span><span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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cfg.bpfilter = <span style="font-variant-ligatures: no-common-ligatures; color: #b12512" class="">
'yes'</span><span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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cfg.bpfreq = <span style="font-variant-ligatures: no-common-ligatures; color: #01a3af" class="">
[</span><span style="font-variant-ligatures: no-common-ligatures; color: #b12512" class="">0.1</span>
<span style="font-variant-ligatures: no-common-ligatures; color: #b12512" class="">
2</span><span style="font-variant-ligatures: no-common-ligatures; color: #01a3af" class="">]</span><span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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cfg.dataset = <span style="font-variant-ligatures: no-common-ligatures; color: #b12512" class="">
'1.fif'</span><span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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data = ft_preprocessing ( cfg )<span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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cfg = <span style="font-variant-ligatures: no-common-ligatures; color: #01a3af" class="">
[]</span><span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
<div style="margin: 0px; font-family: 'Andale Mono'; background-color: rgb(223, 219, 196);" class="">
cfg.channel = meg_channel<span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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cfg.frequency = <span style="font-variant-ligatures: no-common-ligatures; color: #01a3af" class="">
[</span><span style="font-variant-ligatures: no-common-ligatures; color: #b12512" class="">0.1</span>
<span style="font-variant-ligatures: no-common-ligatures; color: #b12512" class="">
2</span><span style="font-variant-ligatures: no-common-ligatures; color: #01a3af" class="">]</span><span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
<div style="margin: 0px; font-family: 'Andale Mono'; background-color: rgb(223, 219, 196);" class="">
meg = ft_selectdata ( cfg, data )<span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
<div style="margin: 0px; font-family: 'Andale Mono'; color: rgb(177, 37, 18); background-color: rgb(223, 219, 196);" class="">
<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class="">disp (
</span>'Saving low delta meg...'<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class=""> )</span></div>
<div style="margin: 0px; font-family: 'Andale Mono'; background-color: rgb(223, 219, 196);" class="">
save low_delta_meg.mat meg <span style="font-variant-ligatures: no-common-ligatures; color: #b6660a" class="">
-</span>v7<span style="font-variant-ligatures: no-common-ligatures; color: #b12512" class="">.3</span><span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
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clearvars cfg meg<span style="font-variant-ligatures: no-common-ligatures; color: #c02ec0" class="">;</span></div>
</div>
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</span></div>
<span class="Apple-tab-span" style="white-space:pre"></span>Line #25 is the last “<span style="font-family: 'Andale Mono'; background-color: rgb(223, 219, 196);" class="">data = ft_preprocessing ( cfg )</span><span style="font-family: 'Andale Mono'; background-color: rgb(223, 219, 196); color: rgb(192, 46, 192);" class="">;</span>”
line.
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>If I do cfg.bpfreq = [2 4] then there is no error but I really like to get this low [0.1 2] range…any tips?</div>
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<div class="">Mona
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<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;">
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<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;">
<div class="">*********************************************</div>
<div class=""> Mona Wong</div>
<div class=""> Web & Mobile Application Developer</div>
<div class=""> San Diego Supercomputer Center</div>
<div class=""><br class="">
</div>
<div class=""> Believing we are in control is an</div>
<div class=""> illusion that brings suffering.</div>
<div class="">*********************************************</div>
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