relation problems :: OpenModelica

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relation problems

Apr-01-11 10:05:39

i want create a ratio between i1 and i2 this ratio should have a range from 0 to 1
so i try

ratio=smooth(2, if i1>i2 then 

i2/i1 else

i1/i2);

but ratio reaches a value of round about 1.049 so i tried

helpratio=smooth(2, if i1>i2 then 

i2/i1 else

i1/i2);

if helpratio>1.0 then

ratio=1.0 else

ratio=helpratio

end if;

but again ratio reaches round about 1.049

then i tested if the second if loop is used

helpratio=smooth(2, if i1>i2 then 

 i2/i1 else

 i1/i2);

if helpratio>1.0 then

 ratio=1.0 else

 ratio=1.0

end if;

then ratio was always 1 but now helpratio has the expected characteristics(between 0 and 1) What i have done wrong?

Apr-01-11 10:13:51

Does the following do what you want?


class A

  Real x = 2-8*time;

  Real y = 1+time^2-time;

  Real ratio = abs(if noEvent(abs(x)>abs(y)) then y/x else x/y);

end A;

Apr-01-11 10:38:47

okay perfect this works

thanks a lot.

P.S. One Question if the noEvent works and smooth not this means that my expression is not continious?

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