Test: Compare the expression check.expr evaluated in the student's environment with the solution correct.expr

Test: Compare the expression check.expr evaluated in the student's environment with the solution correct.expr

check.expr(
  check.expr,
  correct.expr,
  failure.message = "{{check_expr}} has the wrong values!",
  success.message = "Great, {{check_expr}} seems correct.",
  part = NULL,
  ps = get.ps(),
  stud.env = ps$stud.env,
  verbose = FALSE,
  unsubst.check.expr = NULL,
  unsubst.correct.expr = NULL,
  str.check.expr = NULL,
  str.correct.expr = NULL,
  tol = .Machine$double.eps^0.5
)

Arguments

check.expr	the expression to be checked
correct.expr	the correct expression
vars	a variable name or vector of variable names
exists	shall existence be checked (similar length, class, values)
failure.exists	a message that is shown if the variable does not exists (similar the other failure.??? variables)
failure.message.add	a text that will be added to all failure messages