some figures for 20x20x20 mesh (i.e. 8000 elements)
<br><br>
<b>u/p formulation</b><br><br>
<img src=up_20.jpg>

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<b>u/p/f formulation</b> (lines at the right bottom corner i.e. A<sub>pp</sub> block, are graph ticks, not entries.)<br><br>
<img src=upf_20.jpg>

<br><br>
<b>A<sub>uu</sub> block (i.e. elasticity)</b><br><br>
<img src=upf_Auu_20.jpg>

<br><br>
<b>A<sub>ff</sub> block (i.e. darcy) - Hdiv</b> (zero row error is now corrected)<br><br>
<img src=upf_Aff_20.jpg>

<br><br>
<b>nonzero estimates based on nonzeros per element</b><br><br>
<img src=estimate_2.jpg>

<br><br>
<b>nonzero estimates based on log graphs</b><br><br>
<img src=estimate_1.jpg>