This function returns information about the covariates
specified for the cape run.
Usage
get_covar(data_obj)
Value
Returns a list with the following elements:
covar_names: a character vector holding the names of the covariates
covar_type: a character vector indicating whether each covariate
derived from the phenotype matrix ("p") or the genotype matrix ("g")
covar_loc: A numeric vector indicating the locations of each covariate
covar_table: A matrix holding the individual values for each covariate.