[Eeglablist] How to save the normalized data that we see in scroll data display?

[Iman M.Rezazadeh]

Hi,

 

So, I have one question here:

If you normalize the data using zscore , then at each time point the topography of original data and normalized one will be different since for topo map the voltage of adjacent electrodes are also important? 

Could you please clarify more …

 

Best,

Iman

 

Iman M.Rezazadeh, PhD

Postdoctoral Research Fellow

Center for Mind and Brain

University of California, Davis

 <mailto:irezazadeh at ucdavis.edu> irezazadeh at ucdavis.edu

Cell:310-490-1808

Skype: Imanmr

 

 

From: eeglablist-bounces at sccn.ucsd.edu [mailto:eeglablist-bounces at sccn.ucsd.edu] On Behalf Of Edward Justin Modestino
Sent: Tuesday, November 06, 2012 6:50 AM
To: Tim Mullen
Cc: EEGLAB List
Subject: Re: [Eeglablist] How to save the normalized data that we see in scroll data display?

 

Yes, this code works:
normdata = zscore(EEG.data,0,2);
EEG.data = normdata;

On Mon, Nov 5, 2012 at 9:07 PM, Tim Mullen <mullen.tim at gmail.com> wrote:

As I posted earlier, it's simple to compute:

 

normdata = zscore(EEG.data,0,2);

 

No need to reshape, etc. This will normalize each channel and each epoch independently.

 

Tim

 

On Fri, Nov 2, 2012 at 11:23 AM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu> wrote:

Dear Edward,

> Error: Expression or statement is incorrect--possibly unbalanced (, {, or [.

Oops. The line must be


tmp = reshape(EEG.data, [size(EEG.data, 1) size(EEG.data, 2) *

size(EEG.data, 3) ]);

The last parenthesis was missing.
By the way I learned a shortcut for it yesterday, and

tmp = EEG.data(:,:);

should also work.

Makoto


2012/11/2 Edward Justin Modestino <edward.modestino at gmail.com>:
> Makoto,
> I need to be able to get this working as well. I tried it and got the
> following error.

>
>
>>> tmp = reshape(EEG.data, [size(EEG.data, 1) size(EEG.data, 2) *
> size(EEG.data, 3) ];
> tmp = zscore(tmp, 0, 2);
> tmp = reshape(tmp, size(EEG.data));
> EEG.data = tmp;

> ??? tmp = reshape(EEG.data, [size(EEG.data, 1) size(EEG.data, 2) *
>                                                                   |
> Error: Expression or statement is incorrect--possibly unbalanced (, {, or [.

>
>
> On Thu, Nov 1, 2012 at 1:21 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
> wrote:
>>
>> Dear nabaraj,
>>
>> Check out the function zscore.
>> If your data are epoched, then the code should be something like
>>
>> tmp = reshape(EEG.data, [size(EEG.data, 1) size(EEG.data, 2) *
>> size(EEG.data, 3) ];
>> tmp = zscore(tmp, 0, 2);
>> tmp = reshape(tmp, size(EEG.data));
>> EEG.data = tmp;
>>
>> This should normalizes each channel.
>>
>> Makoto
>>
>> 2012/10/29 nabaraj dahal <nabarajdahal at gmail.com>:
>> > Dear list member,
>> > I wish to save the normalized data of all channels for further
>> > processing.
>> > Is there any way I can save the normalized data of all channels that we
>> > see
>> > in scroll data display?
>> > I would be grateful for you help.
>> >
>> > Best Regards,
>> > Nab
>> >
>> > _______________________________________________
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>>
>>
>>
>> --
>> Makoto Miyakoshi
>> JSPS Postdoctral Fellow for Research Abroad
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>> _______________________________________________
>> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
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>
>
>


--
Makoto Miyakoshi
JSPS Postdoctral Fellow for Research Abroad
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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-- 

---------  αντίληψη -----------




-- 
Edward Justin Modestino, Ph.D.
Neuroscientist/Faculty
Atlantic University

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