check.variable | R Documentation |
Test: Check whether a variable is equal to a specified expression
check.variable(
var,
expr,
length = check.all,
dim = check.all,
class = check.all,
values = check.all,
check.all = TRUE,
...,
tol = .Machine$double.eps^0.5,
failure.exists = "You have not yet generated the variable {{var}}.",
failure.length = "Your variable {{var}} has length {{length_stud}} but it shall have length {{length_sol}}.",
failure.dim = "Your variable {{var}} has the wrong dimensions (rows x columns).",
failure.class = "Your variable {{var}} has a wrong class. It should be {{class_sol}} but it is {{class_stud}}.",
failure.values = "Your variable {{var}} has wrong values.",
success.message = "Great, {{var}} has correct {{tests}}.",
ps = get.ps(),
stud.env = ps$stud.env,
verbose = FALSE,
part = NULL
)
var |
a the variable name as string |
expr |
an expression that will be evaluated in the student environment and returns the variable |
length |
shall length be checked (similar dim, class, values) |
failure.length |
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 |
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.