Use of real types...

[Dave Seabury]

I am writing a script for a roof truss. I have to test for three conditions at the heel. For one of the conditions I am testing for zero ie IF heel_height - bottom_cord_height - plumb_cut_topcord = 0 THEN............ but i keep getting a warning "use of real types can result in precision problems"

Is there a way to get around this warning? Is testing for zero what causes it?

Thanks in advance

David

[vistasp]

David, try:

IF heel_height - bottom_cord_height - plumb_cut_topcord < 0.0001 THEN...

A better option, especially if you're going to test this condition multiple times, would be:

Master Script:

EPS = 0.0001

2D/3D scripts:

IF heel_height - bottom_cord_height - plumb_cut_topcord < EPS THEN...

[Barry Kelly]

You might want to make this ... IF ABS(heel_height - bottom_cord_height - plumb_cut_topcord) < 0.0001 THEN...

Just in case you do have the situation where you might have a negative value.
Otherwise any negative value will be less than the tollerence and will trigger the condition.

Barry.

[Piotr Dobrowolski]

The other way is to change the value to string and check if the string ="0" (if the STR parameters set to put 1 character)

If the object has some predefined heights/lenghts/whatever it is kind of useful.

But if the only one thingy is checked - the mentioned before solutions are better.

Best Regards,
Piotr

[Dave Seabury]

Piotr, Barry and Vistasp,

Thanks for the insight and suggestions, I will try these and see if i can get to run as i think it should.

Thanks

David

[Anonymous]

Please see this thread.
http://archicad-talk.graphisoft.com/viewtopic.php?p=44256&highlight=real+types#44256
Peter Devlin