[FieldTrip] about detrend

[Alexander Nakhnikian]

Hello Again,

I think there's an error in my response. I think removing the linear 
trend should also set the mean to zero already since the best fit line 
incorporates vertical offset.  Sorry about that.

A

On 12/5/14, 4:20 PM, Yun Wen wrote:
>
> Hi all, I want to remove DC offset before applying the high-pass 
> filter. I  was wondering if I can achieve that by putting cfg.detrend 
> = 'yes' before cfg.hpfilter = 'yes', something like:
>
> cfg = [];
>
> cfg.dataset = filename_raweeg;
>
> cfg.detrend = 'yes';
>
> cfg.hpfilter = 'yes';
>
> cfg.hpfiltord = 2; % Order of the filter = 2.
>
> cfg.hpfreq = 0.1; % High-pass cutoff at 0.1 Hz;
>
> [data] = ft_preprocessing (cfg);
>
> Thank you in advance.
>
> Best,
>
> Yun
>
>
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