[Eeglablist] Loading and Reading Channel by Channel rather than All Channels at once using loadcnt.

[Arnaud Delorme]

Dear Sahrmin,

the function that reads CNT files in the latest reversion of EEGLAB  
allows to read the data in a memory mapped format (the data is not  
read in memory).
Select memory mapping in the EEGLAB options. Then in the reading  
interface, there is an option to load the file memory mapped. This was  
recently implemented by Craig Rypstat.
You may then downsample.

Arno

On Aug 2, 2009, at 2:50 PM, S N wrote:

> Hi,
>
> We are manually loading the .CNT on a larger server and are unable  
> to do so on a regular desktop machine because the 64 channel .CNTs  
> are huge ~ 1.5GB. They are 10kHz worth of data for 8-10mins.
>
> Instead of needing any further server involvement, I am trying to  
> modify the loadcnt function to only load one channel at a time.  
> Ideally, I would like to be able to specify the channel and retrieve  
> ONLY the EEG.data for that one specified channel and run our code on  
> it, then get the EEG.data for another specified channel. What we  
> want to avoid is having to load the entire .CNT into RAM to get the  
> data out. We can only afford to retrieve the data for one channel.
>
> In addition, is there a function to get only the EEG.event data out  
> of the .CNT without also having to load the entire, huge .CNT file?
>
> Thanks,
> Sharmin <ATT00001.txt>