erplist.extract: Extract data from an erplist.
In erpR: Event-Related Potentials (ERP) Analysis, Graphics and Utility Functions

Description Usage Arguments Details Value Author(s) Examples

This functions extract data from an erplist selecting a subsample of timepoints (i.e., a smaller time window than the original one)

1 2	erplist.extract(bases, numbers, win.ini=NULL, win.end=NULL, point.ini=NULL, point.end=NULL, erplist=NULL, startmsec=NULL, endmsec=NULL)

`bases`	a vector of chars indicating the beginning of the names of `data.frame` containing ERP data. You can specify more than one `base`.
`numbers`	the numbers of the subjects to be averaged by the function.
`win.ini`	the initial edge (in ms) of the window of the timepoints to extract.
`win.end`	the final edge (in ms) of the window of the timepoints to extract.
`point.ini`	the initial point of the timepoints to extract (overridded in `win.ini` or `win.end` are specified).
`point.end`	the final point of the timepoints to extract (overridded in `win.ini` or `win.end` are specified).
`erplist`	a list containing the ERP data frames specified in `base` and `numbers`.
`startmsec`	the start time (in ms) of the ERP vector
`endmsec`	the end time (in ms) of the ERP vector

The function creates a new eplists, with smaller objects then the original. The initial and final timepoints of the new objects are specified (in ms) with win.ini and win.end

A new erplist with the extracted data.

Giorgio Arcara

data(erplistExample)

erplist_ext=erplist.extract(base="Exp1_word_subj", numbers=1:20, 
win.ini=-100, win.end=1200, erplist=erplistExample)

# The new erplist now have data that starts from -100 to 1200 ms