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</button> <span class="navbar-brand"> <a class="navbar-link" href="../../index.html">mkin</a> <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.48.1</span> </span> </div> <div id="navbar" class="navbar-collapse collapse"> <ul class="nav navbar-nav"> <li> <a href="../../reference/index.html">Functions and data</a> </li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false"> Articles <span class="caret"></span> </a> <ul class="dropdown-menu" role="menu"> <li> <a href="../../articles/mkin.html">Introduction to mkin</a> </li> <li> <a href="../../articles/FOCUS_D.html">Example evaluation of FOCUS Example Dataset D</a> </li> <li> <a href="../../articles/FOCUS_L.html">Example evaluation of FOCUS Laboratory Data L1 to L3</a> </li> <li> <a href="../../articles/web_only/FOCUS_Z.html">Example evaluation of FOCUS Example Dataset Z</a> </li> <li> <a 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href="#model-that-can-also-be-solved-with-eigenvalues" class="anchor"></a>Model that can also be solved with Eigenvalues</h2> <p>This evaluation is taken from the example section of mkinfit. When using an mkin version equal to or greater than 0.9-36 and a C compiler (gcc) is available, you will see a message that the model is being compiled from autogenerated C code when defining a model using mkinmod. The <code><a href="../../reference/mkinmod.html">mkinmod()</a></code> function checks for presence of the gcc compiler using</p> <div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb1-1" title="1"><span class="kw"><a href="https://www.rdocumentation.org/packages/base/topics/Sys.which">Sys.which</a></span>(<span class="st">"gcc"</span>)</a></code></pre></div> <pre><code>## gcc ## "/usr/bin/gcc"</code></pre> <p>First, we build a simple degradation model for a parent compound with one metabolite.</p> <div class="sourceCode" id="cb3"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb3-1" title="1"><span class="kw"><a href="https://www.rdocumentation.org/packages/base/topics/library">library</a></span>(<span class="st">"mkin"</span>, <span class="dt">quietly =</span> <span class="ot">TRUE</span>)</a> <a class="sourceLine" id="cb3-2" title="2">SFO_SFO <-<span class="st"> </span><span class="kw"><a href="../../reference/mkinmod.html">mkinmod</a></span>(</a> <a class="sourceLine" id="cb3-3" title="3"> <span class="dt">parent =</span> <span class="kw"><a href="../../reference/mkinsub.html">mkinsub</a></span>(<span class="st">"SFO"</span>, <span class="st">"m1"</span>),</a> <a class="sourceLine" id="cb3-4" title="4"> <span class="dt">m1 =</span> <span class="kw"><a href="../../reference/mkinsub.html">mkinsub</a></span>(<span class="st">"SFO"</span>))</a></code></pre></div> <pre><code>## Successfully compiled differential equation model from auto-generated C code.</code></pre> <p>We can compare the performance of the Eigenvalue based solution against the compiled version and the R implementation of the differential equations using the benchmark package.</p> <div class="sourceCode" id="cb5"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb5-1" title="1"><span class="cf">if</span> (<span class="kw"><a href="https://www.rdocumentation.org/packages/base/topics/library">require</a></span>(rbenchmark)) {</a> <a class="sourceLine" id="cb5-2" title="2"> b<span class="fl">.1</span> <-<span class="st"> </span><span class="kw"><a href="https://www.rdocumentation.org/packages/rbenchmark/topics/benchmark">benchmark</a></span>(</a> <a class="sourceLine" id="cb5-3" title="3"> <span class="st">"deSolve, not compiled"</span> =<span class="st"> </span><span class="kw"><a href="../../reference/mkinfit.html">mkinfit</a></span>(SFO_SFO, FOCUS_<span class="dv">2006</span>_D,</a> <a class="sourceLine" id="cb5-4" title="4"> <span class="dt">solution_type =</span> <span class="st">"deSolve"</span>,</a> <a class="sourceLine" id="cb5-5" title="5"> <span class="dt">use_compiled =</span> <span class="ot">FALSE</span>, <span class="dt">quiet =</span> <span class="ot">TRUE</span>),</a> <a class="sourceLine" id="cb5-6" title="6"> <span class="st">"Eigenvalue based"</span> =<span class="st"> </span><span class="kw"><a href="../../reference/mkinfit.html">mkinfit</a></span>(SFO_SFO, FOCUS_<span class="dv">2006</span>_D,</a> <a class="sourceLine" id="cb5-7" title="7"> <span class="dt">solution_type =</span> <span class="st">"eigen"</span>, <span class="dt">quiet =</span> <span class="ot">TRUE</span>),</a> <a class="sourceLine" id="cb5-8" title="8"> <span class="st">"deSolve, compiled"</span> =<span class="st"> </span><span class="kw"><a href="../../reference/mkinfit.html">mkinfit</a></span>(SFO_SFO, FOCUS_<span class="dv">2006</span>_D,</a> <a class="sourceLine" id="cb5-9" title="9"> <span class="dt">solution_type =</span> <span class="st">"deSolve"</span>, <span class="dt">quiet =</span> <span class="ot">TRUE</span>),</a> <a class="sourceLine" id="cb5-10" title="10"> <span class="dt">replications =</span> <span class="dv">3</span>)</a> <a class="sourceLine" id="cb5-11" title="11"> <span class="kw"><a href="https://www.rdocumentation.org/packages/base/topics/print">print</a></span>(b<span class="fl">.1</span>)</a> <a class="sourceLine" id="cb5-12" title="12"> factor_SFO_SFO <-<span class="st"> </span><span class="kw"><a href="https://www.rdocumentation.org/packages/base/topics/Round">round</a></span>(b<span class="fl">.1</span>[<span class="st">"1"</span>, <span class="st">"relative"</span>])</a> <a class="sourceLine" id="cb5-13" title="13">} <span class="cf">else</span> {</a> <a class="sourceLine" id="cb5-14" title="14"> factor_SFO_SFO <-<span class="st"> </span><span class="ot">NA</span></a> <a class="sourceLine" id="cb5-15" title="15"> <span class="kw"><a href="https://www.rdocumentation.org/packages/base/topics/print">print</a></span>(<span class="st">"R package benchmark is not available"</span>)</a> <a class="sourceLine" id="cb5-16" title="16">}</a></code></pre></div> <pre><code>## Lade nötiges Paket: rbenchmark</code></pre> <pre><code>## test replications elapsed relative user.self sys.self ## 3 deSolve, compiled 3 2.310 1.000 2.308 0 ## 1 deSolve, not compiled 3 17.509 7.580 17.500 0 ## 2 Eigenvalue based 3 2.859 1.238 2.858 0 ## user.child sys.child ## 3 0 0 ## 1 0 0 ## 2 0 0</code></pre> <p>We see that using the compiled model is by a factor of around 8 faster than using the R version with the default ode solver, and it is even faster than the Eigenvalue based solution implemented in R which does not need iterative solution of the ODEs.</p> </div> <div id="model-that-can-not-be-solved-with-eigenvalues" class="section level2"> <h2 class="hasAnchor"> <a href="#model-that-can-not-be-solved-with-eigenvalues" class="anchor"></a>Model that can not be solved with Eigenvalues</h2> <p>This evaluation is also taken from the example section of mkinfit.</p> <div class="sourceCode" id="cb8"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb8-1" title="1"><span class="cf">if</span> (<span class="kw"><a href="https://www.rdocumentation.org/packages/base/topics/library">require</a></span>(rbenchmark)) {</a> <a class="sourceLine" id="cb8-2" title="2"> FOMC_SFO <-<span class="st"> </span><span class="kw"><a href="../../reference/mkinmod.html">mkinmod</a></span>(</a> <a class="sourceLine" id="cb8-3" title="3"> <span class="dt">parent =</span> <span class="kw"><a href="../../reference/mkinsub.html">mkinsub</a></span>(<span class="st">"FOMC"</span>, <span class="st">"m1"</span>),</a> <a class="sourceLine" id="cb8-4" title="4"> <span class="dt">m1 =</span> <span class="kw"><a href="../../reference/mkinsub.html">mkinsub</a></span>( <span class="st">"SFO"</span>))</a> <a class="sourceLine" id="cb8-5" title="5"></a> <a class="sourceLine" id="cb8-6" title="6"> b<span class="fl">.2</span> <-<span class="st"> </span><span class="kw"><a href="https://www.rdocumentation.org/packages/rbenchmark/topics/benchmark">benchmark</a></span>(</a> <a class="sourceLine" id="cb8-7" title="7"> <span class="st">"deSolve, not compiled"</span> =<span class="st"> </span><span class="kw"><a href="../../reference/mkinfit.html">mkinfit</a></span>(FOMC_SFO, FOCUS_<span class="dv">2006</span>_D,</a> <a class="sourceLine" id="cb8-8" title="8"> <span class="dt">use_compiled =</span> <span class="ot">FALSE</span>, <span class="dt">quiet =</span> <span class="ot">TRUE</span>),</a> <a class="sourceLine" id="cb8-9" title="9"> <span class="st">"deSolve, compiled"</span> =<span class="st"> </span><span class="kw"><a href="../../reference/mkinfit.html">mkinfit</a></span>(FOMC_SFO, FOCUS_<span class="dv">2006</span>_D, <span class="dt">quiet =</span> <span class="ot">TRUE</span>),</a> <a class="sourceLine" id="cb8-10" title="10"> <span class="dt">replications =</span> <span class="dv">3</span>)</a> <a class="sourceLine" id="cb8-11" title="11"> <span class="kw"><a href="https://www.rdocumentation.org/packages/base/topics/print">print</a></span>(b<span class="fl">.2</span>)</a> <a class="sourceLine" id="cb8-12" title="12"> factor_FOMC_SFO <-<span class="st"> </span><span class="kw"><a href="https://www.rdocumentation.org/packages/base/topics/Round">round</a></span>(b<span class="fl">.2</span>[<span class="st">"1"</span>, <span class="st">"relative"</span>])</a> <a class="sourceLine" id="cb8-13" title="13">} <span class="cf">else</span> {</a> <a class="sourceLine" id="cb8-14" title="14"> factor_FOMC_SFO <-<span class="st"> </span><span class="ot">NA</span></a> <a class="sourceLine" id="cb8-15" title="15"> <span class="kw"><a href="https://www.rdocumentation.org/packages/base/topics/print">print</a></span>(<span class="st">"R package benchmark is not available"</span>)</a> <a class="sourceLine" id="cb8-16" title="16">}</a></code></pre></div> <pre><code>## Successfully compiled differential equation model from auto-generated C code.</code></pre> <pre><code>## test replications elapsed relative user.self sys.self ## 2 deSolve, compiled 3 4.074 1.000 4.072 0 ## 1 deSolve, not compiled 3 37.219 9.136 37.203 0 ## user.child sys.child ## 2 0 0 ## 1 0 0</code></pre> <p>Here we get a performance benefit of a factor of 9 using the version of the differential equation model compiled from C code!</p> <p>This vignette was built with mkin 0.9.48.1 on</p> <pre><code>## R version 3.5.2 (2018-12-20) ## Platform: x86_64-pc-linux-gnu (64-bit) ## Running under: Debian GNU/Linux 9 (stretch)</code></pre> <pre><code>## CPU model: AMD Ryzen 7 1700 Eight-Core Processor</code></pre> </div> </div> <div class="col-md-3 hidden-xs hidden-sm" id="sidebar"> <div id="tocnav"> <h2 class="hasAnchor"> <a href="#tocnav" class="anchor"></a>Contents</h2> <ul class="nav nav-pills nav-stacked"> <li><a href="#model-that-can-also-be-solved-with-eigenvalues">Model that can also be solved with Eigenvalues</a></li> <li><a href="#model-that-can-not-be-solved-with-eigenvalues">Model that can not be solved with Eigenvalues</a></li> </ul> </div> </div> </div> <footer><div class="copyright"> <p>Developed by Johannes Ranke.</p> </div> <div class="pkgdown"> <p>Site built with <a href="https://pkgdown.r-lib.org/">pkgdown</a> 1.3.0.9000.</p> </div> </footer> </div> </body> </html>