Select timerange

Source: R/data_selection.R

Generic function for selecting specific time ranges from a given dataset. Input can be a dataframe, or an object of class eeg_data, eeg_epochs, or eeg_evoked. Note this finds the closest times to those specified, so the time range returned may be slightly longer or shorter than that requested.

select_times(data, ...)

# S3 method for default
select_times(data, time_lim = NULL, ...)

# S3 method for eeg_data
select_times(data, time_lim = NULL, df_out = FALSE, ...)

# S3 method for eeg_epochs
select_times(data, time_lim, df_out = FALSE, ...)

# S3 method for eeg_evoked
select_times(data, time_lim, df_out = FALSE, ...)

# S3 method for eeg_tfr
select_times(data, time_lim = NULL, df_out = FALSE, ...)

Arguments

data

Data from which to select
...

Further arguments passed to or from other methods.
time_lim

A character vector of two numbers indicating the time range to be selected e.g. c(min, max)
df_out

Returns a data frame rather than an object of the same type that was passed in.

Value

Data frame with only data from within the specified range.

eeg_data object

Methods (by class)

  • default: Default select times function

  • eeg_data: Select times from an eeg_data object

  • eeg_epochs: Select times in eeg_epochs objects

  • eeg_evoked: Select times in eeg_evoked objects

  • eeg_tfr: Select times from an eeg_tfr object

See also

select_elecs() and select_epochs()

Other Data selection functions: select_elecs()

Author

Matt Craddock, matt@mattcraddock.com

Examples

## Select timepoints from -.1 to .3
demo_epochs

#> Epoched EEG data
#> 
#> Number of channels	: 11 
#> Number of epochs	: 80 
#> Epoch limits		: -0.197 - 0.451 seconds
#> Electrode names		: A5 A13 A21 A29 A31 B5 B6 B8 B16 B18 B26 
#> Sampling rate		: 128  Hz
#> Reference		: average 
short_epochs <- select_times(demo_epochs, time_lim = c(-.1, .3))
short_epochs

#> Epoched EEG data
#> 
#> Number of channels	: 11 
#> Number of epochs	: 80 
#> Epoch limits		: -0.096 - 0.295 seconds
#> Electrode names		: A5 A13 A21 A29 A31 B5 B6 B8 B16 B18 B26 
#> Sampling rate		: 128  Hz
#> Reference		: average