[FieldTrip] About huge delay for ft_read_data to return

[Alexander Maye]

Hi Martin,

if I remember correctly, it helps to read the header once (ft_read_header) and 
then pass it to the ft_read_data calls. For continuous reading you need to 
update the sample information inside the header struct with the data from 
ft_poll_buffer.

Best,

		ALEX.

Am Mittwoch, 19. November 2014, 16:24:43 schrieb Martin Dinov:
> Dear all,
> 
> I'm trying to do something with realtime EEG data and I'm using the
> ft_read_data function get data from BrainVision Recorder via rda2ft. In
> MATLAB, calling ft_read_data seems to always take >=500ms (even for a
> single sample point from data with srate of 1000Hz) which is
> unacceptably slow for what I want to do. Perhaps specifying channel
> indices to read only some of the data would speed it up, but I haven't
> managed to get this to work. As I am trying to phase lock to the alpha
> band, I need to be able to read in single sample points (after an
> initial larger block that can take longer) much quicker than 500ms
> (<50ms). I highly appreciate any help with this!
> 
> Thanks in advance
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