[Mne_analysis] Twice ICA components differences

[Denis-Alexander Engemann]

Hi Qunxi,

I can confirm this issue. I think I found a bug in the ICA code.
Let's move this discussion to Github.

Best,
Denis

On Thu, Feb 27, 2014 at 10:35 AM, 董群喜 <dongqunxi at gmail.com> wrote:
> Dear All,
>
> When I used ICA twice continually, I got different amount of components. I
> think it must be something wrong about my script.
> Can anyone help me to check the script? By this script, I got amount of
> components:
>
> <ICA  |  raw data decomposition, fit: 13900 samples, 184 components>
> <ICA  |  raw data decomposition, fit: 13900 samples, 167 components>
>
> import mne
> from mne.preprocessing import ICA
> from mne.datasets import sample
>
> data_path = sample.data_path()
> raw_fname = data_path + '/MEG/sample/sample_audvis_filt-0-40_raw.fif'
> n_components=0.99
> max_pca_components=None
>
> raw = mne.fiff.Raw(raw_fname, preload=True)
> picks = mne.fiff.pick_types(raw.info, meg=True, exclude='bads')
> ica = ICA(n_components=n_components, max_pca_components=max_pca_components,
>                random_state=0)
> ica.decompose_raw(raw, picks=picks, decim=3)
> print ica
> raw_new = ica.pick_sources_raw(raw)
> picks = mne.fiff.pick_types(raw_new.info, meg=True, exclude='bads')
> ica = ICA(n_components=n_components, max_pca_components=max_pca_components,
>           random_state=0)
> ica.decompose_raw(raw_new, picks=picks, decim=3)
> print ica
>
> Best wishes,
> Qunxi Dong
>
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