Sample density maps with coordinates derived from fixation groups.

this function extracts the density for any arbitrary time point in a trial. It simply extracts the value of the density map for the fixation at time t. The fixations are taken from the `fixgroup` variable and may be associated, for example, with an independent set of trials.

Usage

template_sample(
  source_tab,
  template,
  fixgroup = "fixgroup",
  time = NULL,
  outcol = "sample_out"
)

Arguments

source_tab: the name of the table containing the density map and fixations
template: the name of the template density variable
fixgroup: the name of the fixation group supplying the spatiotemporal coordinates used to sample the template
time: the time points used to extract coordinates from the `fixation_group`
outcol: the name of the output variable