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Re: [Question #692420]: Select bodies under post2d.extractor function

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Jan Stránský <question692420@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 18 Aug 2020 13:11:06 -0000
Reply-to: question692420@xxxxxxxxxxxxxxxxxxxxx
Sender: bounces@xxxxxxxxxxxxx

Question #692420 on Yade changed:
https://answers.launchpad.net/yade/+question/692420

    Status: Open => Needs information

Jan Stránský requested more information:
Hello,

> I was only able to think of two ways

it is actually one way, see below

> but seems like lambda expressions cannot take conditional statements.

it can:
extractVelocity=lambda b: flattener.normal(b,b.state.vel) if -0.15< b.state.pos[2] <= 0.15 else None

Please provide a MWE [1], something like a few predefined spheres with
predefined positions and velocities and describe expected result.

cheers
Jan

[1] https://www.yade-dem.org/wiki/Howtoask

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