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From Angelo Port <angel.a.porti...@boeing.com>
Subject Re: [math] Re: ODE Question
Date Thu, 04 Jun 2009 22:01:52 GMT

Luc,

Ok, I missed that. I will post as stated next time. 

I did set it, but not to 6, my mistake.

Thanks for the help,
Angelo


Luc Maisonobe wrote:
> 
> Angelo Port a écrit :
>> Hi,
> 
> Hello,
> 
> First, please use a marker like [math] when posting to this list
> according to the commons component you use. This list is shared by
> several components, so it helps subscribers filter the messages.
> 
>> 
>>  
>> 
>> I am attempting to use the Dormand-Prince 54 integrator. I get the
>> following
>> error:
>> 
>> org.apache.commons.math.ode.IntegratorException: dimensions mismatch: ODE
>> problem has dimension 0, initial state vector has dimension 6
>>         at
>> org.apache.commons.math.ode.AdaptiveStepsizeIntegrator.sanityChecks(AdaptiveStepsizeIntegrator.java:177)
>>         at
>> org.apache.commons.math.ode.EmbeddedRungeKuttaIntegrator.integrate(EmbeddedRungeKuttaIntegrator.java:179)
>> 
>> Did I forget to set the dimension? If so, how is this done?
> 
> The problem you pass to the integrator implements the
> FirstOrderDifferentialEquations interfaces, which has a getDimension()
> method. This method must provide the dimension of the set of
> differential equations it computes. In your case, I guess you should have:
> 
> public int getDimension() {
>   return 6;
> }
> 
> This must be consistent with the dimension of the state vector.
> 
> Luc
> 
>> 
>>  
>> 
>> Angelo
>> 
>> 
> 
> 
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