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<h1>Datastructures</h1>
<h2>A-matrix</h2>
<p>The A-matrix is stored in the lp structure in element matA and is defined in structure MATrec.
Only the non-zero elements of this matrix are stored. This is called a sparse matrix.
In MATrec, the following elements are of importance in the matrix data:</p>
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<li>rows</li>
<li>columns</li>
<li>col_end</li>
<li>row_mat</li>
<li>row_end</li>
<li>col_mat_colnr</li>
<li>col_mat_rownr</li>
<li>col_mat_value</li>
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<p>Elements are stored per column, then per row. col_mat_value containts the values.
So first a[1][1], then a[2][1], then a[3][1], ..., a[2][1], a[2][2], ...
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