Check constraints

Check that a user-provided constraint is parsable, has valid variables and relations.

Usage

constraintscheck(constrainttext, graphres)

Arguments

constrainttext

A string representing a constraint.

graphres

An igraph object representing a DAG.

Value

TRUE if all check pass; else FALSE.

Examples

graphres <- graph_from_literal(Z -+ X, X -+ Y, Ul -+ Z, Ur -+ X, Ur -+ Y)
V(graphres)$leftside <- c(1, 0, 0, 1, 0)
V(graphres)$latent <- c(0, 0, 0, 1, 1)
V(graphres)$nvals <- c(3, 2, 2, 2, 2)
V(graphres)$exposure <- c(0, 1, 0, 0, 0)
V(graphres)$outcome <- c(0, 0, 1, 0, 0)
E(graphres)$rlconnect <- c(0, 0, 0, 0, 0)
E(graphres)$edge.monotone <- c(0, 0, 0, 0, 0)
constrainttext <- "X(Z = 1) >= X(Z = 0)"
constraintscheck(constrainttext = constrainttext, graphres = graphres) # TRUE
#> [1] TRUE