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Workaround for "Divison by zero"

#4396  Permalink Top

Workaround for "Divison by zero"

Apr-01-14 13:53:00

Hi,

Have a look at this following model.

model test
  Real X;
equation
  X = atan(1 / (1 - time));
end test;

I want to get the value of X over a period of time. But as soon as time becomes 1, I get the division by zero error and the simulation fails. Shouldn't atan() be able to valuate any real number? Is there any workaround for this?

Thanks,

Sanjay

#4397  Permalink Top

Re: Workaround for "Divison by zero"

Apr-01-14 13:57:53

atan may be able to evaluate any real value. But division does not.

#4398  Permalink Top

Re: Workaround for "Divison by zero"

Apr-01-14 14:08:30

Is there any alternative for this ?

#4399  Permalink Top

Re: Workaround for "Divison by zero"

Apr-01-14 14:11:33

Yes. Not writing code that triggers division by zero... Using limits and rewriting the expression I suppose. Infinity is not a valid real value in Modelica.

#4400  Permalink Top

Re: Workaround for "Divison by zero"

Apr-01-14 14:21:58

Thanks.

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