iscrete distributions, require integer arguments.</p>
<p>A two-dimensional array is just an array of arrays, both conceptually
and in terms of current implementation. When an index is supplied to
an array, it returns the value at that index. When more than one
index is supplied, this indexing operation is chained. For example, if
<code>a</code> is a two-dimensional array, then <code>a[m, n]</code> is just
a convenient shorthand for <code>a[m][n]</code>.</p>
<p>Vectors, matrices, and arrays are not assignabl