takes in the parameter table and checks if any of the modifiers therein is an mxAlgebra. If so, it replaces the modifier with a temporary name and adds an algebra to the algebra data.frame
check_modifier_for_algebra(parameter_table, directed, undirected)data.frame with parameters (parameter table)
parameter table
symbol used to indicate directed effects (regressions and loadings)
symbol used to indicate undirected effects (variances and covariances)