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  <title>Matrix transpose 3×3</title>
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  <h1>Transpose 3×3</h1>
  <p>Edit <code>a</code>, then <strong>Run</strong>.</p>
  <pre id=out></pre>
  <script>!function(){function n(n,t,o){var r,u,e;for(n.push(t),r=0;r<3;r++){for(e="",u=0;u<3;u++)e+=o[r][u]+" ";n.push(e)}}var t=[[1,2,3],[4,5,6],[7,8,9]],o=function(n){var t,o,r=[];for(t=0;t<3;t++)for(r[t]=[],o=0;o<3;o++)r[t][o]=n[o][t];return r}(t),r=[];n(r,"A",t),r.push(""),n(r,"A^T",o),document.getElementById("out").textContent=r.join("\n")}()</script>
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JavaScript Matrix Transpose — 3×3 (Try It)