mt_count {mousetrap}

Count number of observations.

Description

Count number of observations per trial for a specified dimension (or several) in the trajectory array. This is mostly a helper function used by other functions in this package.

Usage

mt_count(data, use = "trajectories", save_as = "measures", dimensions = "xpos")

Arguments

data

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.

dimensions

a character vector specifying the name of the dimension(s) that should be used for counting the number of observations. If several dimensions are specified, the number of complete observations are reported.

Value

A mousetrap data object (see mt_example).

If a data.frame with label specified in save_as (by default "measures") already exists, the number of observations (called nobs) are added as additional column. If not, an additional data.frame will be added.

If a trajectory array was provided directly as data, only a named character vector will be returned.

Author(s)

Pascal J. Kieslich

Examples

# Retrieve vector that counts number of observations
mt_count(mt_example$trajectories)