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<p>Dear all</p>
<p>I need to know what is the timestep of simulation, in order to calculate the mean velocity of a particle ( knowing diffusion coefficient). In Simulation/SimulationParams.java I found the parameter dt (<span> /** the increment of time corresponding to a timestep
*/ ) and the method getDt() to get It.</span></p>
<p><span><br>
</span></p>
<p><span>/***** code of SimulationParams.java */</span></p>
<p><span><br>
</span></p>
<p><span></p>
<div> /** set the echo time and dt increment properly */<br>
double TE=((SimulableScheme)imPars).getDuration();<br>
<br>
//double halfP90= imPars.getHalfP90(0);<br>
<br>
//this.dt=(halfP90+TE)/((double)tmax);<br>
<br>
this.dt=TE/((double)tmax);</div>
....</span>
<p></p>
<p><span>/*************************************************************************/<br>
</span></p>
<p><span><br>
</span></p>
<p><span>I used this method in tool/CL_Initializer.java </span></p>
<p><span> private static double dt=simParams.getDt(); <br>
</span></p>
<p><span><br>
</span></p>
<p>and when I executed a datasinth I obtained this error:</p>
<p></p>
<div>Exception in thread "main" java.lang.ExceptionInInitializerError<br>
at apps.SyntheticData.initOptions(SyntheticData.java:46)<br>
at apps.Executable.<init>(Executable.java:24)<br>
at apps.SyntheticData.<init>(SyntheticData.java:34)<br>
at apps.EntryPoint.getExecutable(EntryPoint.java:222)<br>
at apps.EntryPoint.main(EntryPoint.java:282)<br>
Caused by: java.lang.NullPointerException<br>
<span style="color: rgb(255, 0, 0);"> at tools.CL_Initializer.<clinit>(CL_Initializer.java:176)</span><u></u><br>
... 5 more</div>
<p></p>
<p>I found<span style="font-size: 20pt;"></span> that method getDuration() is not declared in interface SimulableScheme.. Is this the problem?<span id="result_box" class="short_text" lang="en"><span class=""> What should be the code?</span></span></p>
<p><span id="result_box" class="short_text" lang="en"><span class=""><br>
</span></span></p>
<p><span id="result_box" class="short_text" lang="en"><span class="">Thank you <br>
</span></span></p>
<p><span id="result_box" class="short_text" lang="en"><span class="">Cheers</span></span></p>
<p><span id="result_box" class="short_text" lang="en"><span class=""><br>
</span></span></p>
<p><span id="result_box" class="short_text" lang="en"><span class="">Stefania Oliviero</span></span><br>
</p>
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