a mousetrap data object created using one of the mt_import
functions (see mt_example for details). Alternatively, a trajectory
array can be provided directly (in this case use will be ignored).
use
a character string specifying which trajectory data should be
used.
save_as
a character string specifying where the resulting trajectory
data should be stored.
xpos_start
an integer specifying the value the first x-position should
have in each trial.
ypos_start
an integer specifying the value the first y-position should
have in each trial.
show_progress
logical indicating whether function should report on its
progress.
Value
A mousetrap data object (see mt_example) with aligned
trajectories. If the trajectory array was provided directly as data,
only the trajectory array will be returned.