Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help ft_realtime_signalviewer”.
FT_REALTIME_SIGNALVIEWER is an example realtime application for online viewing of the data. It should work both for EEG and MEG. Use as ft_realtime_signalviewer(cfg) with the following configuration options cfg.blocksize = number, size of the blocks/chuncks that are processed (default = 1 second) cfg.channel = cell-array, see FT_CHANNELSELECTION (default = 'all') cfg.jumptoeof = whether to skip to the end of the stream/file at startup (default = 'yes') cfg.bufferdata = whether to start on the 'first or 'last' data that is available (default = 'first') cfg.readevent = whether or not to copy events (default = 'no') cfg.demean = 'no' or 'yes', whether to apply baseline correction (default = 'yes') The source of the data is configured as cfg.dataset = string or alternatively to obtain more low-level control as cfg.datafile = string cfg.headerfile = string cfg.eventfile = string cfg.dataformat = string, default is determined automatic cfg.headerformat = string, default is determined automatic cfg.eventformat = string, default is determined automatic Some notes about skipping data and catching up with the data stream: cfg.jumptoeof='yes' causes the realtime function to jump to the end when the function _starts_. It causes all data acquired prior to starting the realtime function to be skipped. cfg.bufferdata='last' causes the realtime function to jump to the last available data while _running_. If the realtime loop is not fast enough, it causes some data to be dropped. If you want to skip all data that was acquired before you start the RT function, but don't want to miss any data that was acquired while the realtime function is started, then you should use jumptoeof=yes and bufferdata=first. If you want to analyse data from a file, then you should use jumptoeof=no and bufferdata=first. To stop this realtime function, you have to press Ctrl-C