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From: zhang wei on 12 Jun 2010 23:27
when i use the dde23 to solve a delay differential euqation,it always

Warning: Failure at t=1.369240e+001. Unable to meet integration tolerances without
reducing the step size below the smallest value allowed (2.842171e-014) at time t.
> In dde23 at 486
In revisemodel_delay>fitnessrevisemodel at 236
In revisemodel_delay at 123

i have set the options=ddeset('RelTol',1e-4,'AbsTol',1e-7);

would you tell me how to handle the problem ?
From: Steven Lord on 14 Jun 2010 10:32

"zhang wei" <zhang20051252(a)126.com> wrote in message
news:hv1j68$t83$1(a)fred.mathworks.com...
> when i use the dde23 to solve a delay differential euqation,it always
> Warning: Failure at t=1.369240e+001. Unable to meet integration
> tolerances without
> reducing the step size below the smallest value allowed (2.842171e-014) at
> time t.
>> In dde23 at 486
> In revisemodel_delay>fitnessrevisemodel at 236
> In revisemodel_delay at 123
>
> i have set the options=ddeset('RelTol',1e-4,'AbsTol',1e-7);
> would you tell me how to handle the problem ?

Try relaxing your tolerances.

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Steve Lord
slord(a)mathworks.com
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