Float Parameter Problem !

[Joker386]

hi

I created a custom Float Parameter from Parameter Interface .

when I set this parameter to (0.1) , the actual value is (0.100000001)

why ? how can I fix it ?

[edward]

Make sure you're looking at the parameter in value mode. The name of the parameter should NOT have a dark background.

[gaurav]

when I set this parameter to (0.1) , the actual value is (0.100000001)

why ?

This is due to the nature of binary floating point representation.

More on it here. http://docs.python.org/tutorial/floatingpoint.html

Edward already mentioned the value mode toggle.

Cheers,

[Joker386]

thanks my friends

so how can I fix it ?

for example i want create a counter attribute.

I created a attribute for particles by name "count"

I add a custom parameter by name "Steps" and set it to 0.1 (but in natural it's equal to 0.100000001)

I write below expression for attribute's value :

{

if($FF < 10 )

{

a = $COUNT + ch("steps") ;

return a;

}

else

{

if ($COUNT > 0 )

{

a = $COUNT - ch("steps") ;

return $COUNT ;

}

}

}

but I have problem here !

when $COUNT = 0.1 then in the next step $COUNT = 1.49012e-008 and in the next step $COUNT = -0.1 and in the next step it equal to 0 ?

if I replace number 0.1 instead ch("steps") in the expression , every things are OK ,why ?!

I attach my sample Project , select attribute_Counter in the popnet1 and open Spreadsheet and check count value !

[Joker386]

Sample Project :

CountGeo.hip

[gaurav]

Make it int.

Counter and steps should both be integer type.

Cheers,

[Joker386]

Thanks

[magneto]

Make sure you're looking at the parameter in value mode. The name of the parameter should NOT have a dark background.

This only works for the light color theme