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Student Support Forum: 'Problem with FindInstance' topicStudent Support Forum > General > Archives > "Problem with FindInstance"

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Author Comment/Response
Peter Pein
11/10/09 2:12pm

Maybe your installation of Mathematica is broken or your computer is too slow?

In[1]:= FindInstance[{(1/(Sqrt[1-0.2^2]*0.6))*Exp[-0.2*t/0.6]*Sin[Sqrt[1-0.2^2]*t/0.6]==0.02,15>t>0},t,2]
Out[1]= {{t->7.7924},{t->3.87385}}

To get all solutions for 0<t<15 use Reduce and ignore the warning

In[2]:= {Reduce[{(1/(Sqrt[1-0.2^2]*0.6))*Exp[-0.2*t/0.6]*Sin[Sqrt[1-0.2^2]*t/0.6]==0.02,15>t>0},t]//N//ToRules}
Out[2]= {{t->0.00721751},{t->1.91021},{t->3.87385},{t->5.72292},{t->7.7924},{t->9.44898},{t->11.9636},{t->12.844}}


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Subject (listing for 'Problem with FindInstance')
Author Date Posted
Problem with FindInstance Augusto 10/30/09 00:08am
Re: Problem with FindInstance Peter Pein 11/10/09 2:12pm
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