假设下面有2 x 2矩阵<div class="root">
<div class="analysisPanel">
<div class="titleBarCtr">
<h3 class="titleBar truncatedText">
Testing a long string that should be truncated
</h3>
<a class="icon" aria-current="false" role="button" href="#"><i class="fa fa-dashboard" aria-hidden="true" title="Load Estimation"></i></a>
</div>
</div>
</div>，我想知道是否有任何R基函数可以给我相反的对角线元素（这里m和2）？< / p>
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