[Yade-users] [Question #267838]: How to use function updateAttrs
New question #267838 on Yade:
https://answers.launchpad.net/yade/+question/267838
There are many updateAttrs function in different classes, According to my
knowledge, this function is used to change attributes of classes with a
dictionary. But what's the parameter that I should give?
For instance, I'd like to update yade.O.bodies[1].state.pos to [0,0,0], I
write a code like that:
yade.O.bodies[1].state.updateAttrs({yade.O.bodies[1].state.pos:[0,0,0]})
and the result is:
TypeError: No registered converter was able to produce a C++ rvalue of type
std::string from this Python object of type Vector3
How should I modify it?
Hope to get some help,
thanks.
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Re: [Yade-users] [Question #267838]: How to use function updateAttrs
Question #267838 on Yade changed:
https://answers.launchpad.net/yade/+question/267838
Status: Open = Answered
Jan Stránský proposed the following answer:
Hi Mike,
updateAttrs is used mainly in serialization (saving/loading) of objects. In
your case, you can directly use
O.bodies[1].state.pos = (0,0,0)
if you want to use updateAttrs, is accepts dictionary, whose keys are
srting names of attributes. So it could be
O.bodies[1].state.updateAttrs({pos:(0,0,0)})
However, it does not work. Sometimes the variables (like pos) are
internally treated in different way, e.g. pos is one part od Se3 instance,
containing position and orientation, so setting position with updateAttrs
would look like:
s = O.bodies[1].state
s.updateAttrs({se3:((0,0,0),s.ori)}) # (0,0,0) is new position, one part
of se3, the other part being orientation
As a conclusion, I would suggest to try to avoid using updateAttrs if
possible :-)
cheers
Jan
2015-06-06 15:46 GMT+02:00 MikeZhao
question267...@answers.launchpad.net:
New question #267838 on Yade:
https://answers.launchpad.net/yade/+question/267838
There are many updateAttrs function in different classes, According to my
knowledge, this function is used to change attributes of classes with a
dictionary. But what's the parameter that I should give?
For instance, I'd like to update yade.O.bodies[1].state.pos to
[0,0,0], I write a code like that:
yade.O.bodies[1].state.updateAttrs({yade.O.bodies[1].state.pos:[0,0,0]})
and the result is:
TypeError: No registered converter was able to produce a C++ rvalue of
type std::string from this Python object of type Vector3
How should I modify it?
Hope to get some help,
thanks.
--
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yade-users, which is an answer contact for Yade.
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Re: [Yade-users] [Question #267838]: How to use function updateAttrs
Hi Mike,
updateAttrs is used mainly in serialization (saving/loading) of objects. In
your case, you can directly use
O.bodies[1].state.pos = (0,0,0)
if you want to use updateAttrs, is accepts dictionary, whose keys are
srting names of attributes. So it could be
O.bodies[1].state.updateAttrs({pos:(0,0,0)})
However, it does not work. Sometimes the variables (like pos) are
internally treated in different way, e.g. pos is one part od Se3 instance,
containing position and orientation, so setting position with updateAttrs
would look like:
s = O.bodies[1].state
s.updateAttrs({se3:((0,0,0),s.ori)}) # (0,0,0) is new position, one part
of se3, the other part being orientation
As a conclusion, I would suggest to try to avoid using updateAttrs if
possible :-)
cheers
Jan
2015-06-06 15:46 GMT+02:00 MikeZhao question267...@answers.launchpad.net:
New question #267838 on Yade:
https://answers.launchpad.net/yade/+question/267838
There are many updateAttrs function in different classes, According to my
knowledge, this function is used to change attributes of classes with a
dictionary. But what's the parameter that I should give?
For instance, I'd like to update yade.O.bodies[1].state.pos to
[0,0,0], I write a code like that:
yade.O.bodies[1].state.updateAttrs({yade.O.bodies[1].state.pos:[0,0,0]})
and the result is:
TypeError: No registered converter was able to produce a C++ rvalue of
type std::string from this Python object of type Vector3
How should I modify it?
Hope to get some help,
thanks.
--
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yade-users, which is an answer contact for Yade.
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