an overall size of zero, but in this case,
there is no way to index legally into <code>b</code>, because <code>b[0]</code> is
undefined. The array will behave at run time as if it’s a <span class="math inline">\(0 \times 0\)</span> array. For example, the result of <code>to_matrix(b)</code> will be a
<span class="math inline">\(0 \times 0\)</span> matrix, not a <span class="math inline">\(0 \times 3\)</span> matrix.</p>
</div>
</div>
            </section>

          </div>
        </div>
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<a 