ou will generally not need to supply a label. But if you’re calling it on
an object property or an expression more complex than a simple variable reference, the
validator cannot automatically detect the input name for use in the label. In this case,
make use of the optional trailing argument(s) to the functions to manually supply a
label for the value being tested.
</p>
<div class="example">
<pre class="example-preformatted">% Validation of a simple variable does not need a label
mustBeScalar (x);
% Valid