<h2>Logfile output</h2>
First, the program produces the usual logfile here stored in <tt>deallog</tt>. It reads (with ommission of intermediate steps)
-<pre>
+
+@code
DEAL::Element: FE_DGQ<2>(3)
DEAL::Step 0
DEAL::Triangulation 4 cells, 1 levels
DEAL::Error 0.00716966
DEAL::Estimate 0.0681646
DEAL::Writing solution to <sol-11.gnuplot>...
-</pre>
+@endcode
This log for instance shows that the number of conjugate gradient
iteration steps is constant at approximately 12.
<h2>Postprocessing of the logfile</h2>
-<img align="right" alt="Convergence graphs" src="step-39-convergence.png">
+@image html "step-39-convergence.png"
Using the perl script <tt>postprocess.pl</tt>, we extract relevant
data into <tt>output.dat</tt>, which can be used to plot graphs with
<tt>gnuplot</tt>. The graph on the right for instance was produced with
-<pre>
+
+@code
set style data linespoints
set logscale
set xrange [50:3000]
plot "output.dat" using 2:3 title "error", "" using 2:4 title "estimate", \
"" using 2:(3000*$2**-1.5) title "3rd order"
-</pre>
+@endcode