n class="fl">3</span><span class="op">*</span><span class="va">I</span> <span class="op">*</span><span class="fl">2</span>, <span class="op">-</span><span class="fl">2</span>, <span class="fl">2</span> <span class="op">)</span>, nrow<span class="op">=</span><span class="fl">3</span><span class="op">*</span><span class="va">I</span>, <span class="fl">2</span> <span class="op">)</span></span>
<span><span class="va">b</span> <span class="op">&lt;-</span> <span class="va">b</span><span class="op">*</span><span 