No, Boost.MultiArray is not what you are looking for.<br><br>Boost.MultiArray is for data organized as a multi-dimensional &quot;box&quot;: each of its dimension has a specified size. In 3D, these can be understood as height, width and length. Memory is allocated for every possible elements within this box, no exception.<br>
<br>&gt; a00 a01 a02 a03 a04 a05 a06 a07 a08<br>&gt; a10 a11 a12 a13 a14<br>&gt; a20 a21 a22<br>&gt; a30 a31<br>&gt; a40<br><br>For your 2D example, you could use a vector of vector.<br><br>std::vector&lt; std::vector&lt; my_type &gt; &gt; storage(5); // Your example has 5 lines.<br>
storage[0].resize(9); // The first line of your example has 9 elements.<br>storage[1].resize(5); // The second line of your example has 5 elements.<br>storage[2].resize(3); // ...<br>storage[3].resize(2);<br>storage[4].resize(1);<br>
<br>If your data is organized according to a &quot;simplex&quot; topology (the multi-dimensional extension of a triangular matrix, see <a href="http://en.wikipedia.org/wiki/Simplex">http://en.wikipedia.org/wiki/Simplex</a> ), then I may have something for you. Contact me again and I will give you further information. However, from your example, I guess that this is not the case.<br>
<br>Pierre-André Noël<br><br><div class="gmail_quote">2011/9/7 Júlio Hoffimann <span dir="ltr">&lt;<a href="mailto:julio.hoffimann@gmail.com">julio.hoffimann@gmail.com</a>&gt;</span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Dear all,<div><br></div><div>By reading Boost.MultiArray docs, i haven&#39;t figured out any possible way to deal with unbalanced matrices. The following picture explains what i mean by unbalanced:</div><div><br></div><div>

// two dimensional unbalanced matrix:</div><div><br></div><div>a00 a01 a02 a03 a04 a05 a06 a07 a08</div><div>a10 a11 a12 a13 a14</div><div>a20 a21 a22</div><div>a30 a31</div><div>a40</div><div><br></div><div>Each row has it&#39;s own extent (defined at runtime). Seems multi_array&lt;&gt; classes are not designed to increase it&#39;s subcontainers decoupled, and at a given depth, they always share the same extent? Could you confirm or guide me in how to achieve this behavior? I really need to save memory due to large 3D matrices.</div>

<div><br></div><div>Regards,</div><div>Júlio.</div>
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