[Yade-dev] [Bug 1031703] Re: extra value for bodies
** Changed in: yade Status: New = Invalid -- You received this bug notification because you are a member of Yade developers, which is subscribed to Yade. https://bugs.launchpad.net/bugs/1031703 Title: extra value for bodies Status in Yet Another Dynamic Engine: Invalid Bug description: Hi, It would be very helpful, if there would be an extra value for every body. This value can be set by the user. It must be a very fexible value (bool, int, float, vector, array, etc.). Example: I create a clump, which consists of two hardly overlapping spheres and sometimes I need the volume of the clump (which is not the sum of the volumes of the two spheres in this case). So this could be easily managed by this extra value. Where i could set either the volume of the clump as extra value to the clump or i could set the volume fractions as extra values to the spheres. To manage notifications about this bug go to: https://bugs.launchpad.net/yade/+bug/1031703/+subscriptions ___ Mailing list: https://launchpad.net/~yade-dev Post to : yade-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-dev More help : https://help.launchpad.net/ListHelp
[Yade-dev] [Bug 1031703] Re: extra value for bodies
The problem is not how to access the extra variables in python but how to implement them in c++. For storing arbitrary types, I see at least two ways: 1/ void pointers + some typecasting 2/ add template parameters to the class Body (2) is forbidden in yade as serialization and python wrapping don't seem to like templates. (1) would be complex to implement but it could work maybe. Of course, it is possible to add a float and a int to each body, call them extraInt/extraReal, and let the users use them or not. However, it can't be extended since it means a waste of memory as soon as the extra variables are not used. If the only problem of Jan's suggestion is that the values are not saved, then the simpler thing would be to find a convenient way to save them. Now, to be honest, I should mention that there are already 7 extra values in each body: ((Vector3r,refPos,Vector3r::Zero(),,Reference position)) ((Quaternionr,refOri,Quaternionr::Identity(),,Reference orientation)) Since they are only used for a very specific type of postprocessing, you can assign any value to them without interfering with the computation. However, it is a short term solution since I would like to remove these parameters one day. -- You received this bug notification because you are a member of Yade developers, which is subscribed to Yade. https://bugs.launchpad.net/bugs/1031703 Title: extra value for bodies Status in Yet Another Dynamic Engine: New Bug description: Hi, It would be very helpful, if there would be an extra value for every body. This value can be set by the user. It must be a very fexible value (bool, int, float, vector, array, etc.). Example: I create a clump, which consists of two hardly overlapping spheres and sometimes I need the volume of the clump (which is not the sum of the volumes of the two spheres in this case). So this could be easily managed by this extra value. Where i could set either the volume of the clump as extra value to the clump or i could set the volume fractions as extra values to the spheres. To manage notifications about this bug go to: https://bugs.launchpad.net/yade/+bug/1031703/+subscriptions ___ Mailing list: https://launchpad.net/~yade-dev Post to : yade-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-dev More help : https://help.launchpad.net/ListHelp
Re: [Yade-dev] [Bug 1031703] Re: extra value for bodies
The problem is not how to access the extra variables in python but how to implement them in c++. For storing arbitrary types, I see at least two ways: 1/ void pointers + some typecasting 2/ add template parameters to the class Body 3/ store the string representation of desired variable (as suggested a few mails above). From my point of view it would be the least effort and for the same functionality. Example: Yade [1]: b = utils.sphere((1,2,3),4) Yade [2]: O.bodies.append(b) - [2]: 0 Yade [3]: a = Vector3(1,2,3) Yade [4]: b.extra = repr(a) Yade [5]: b.extra - [5]: 'Vector3(1,2,3)' Yade [6]: c = eval(b.extra) Yade [7]: c - [7]: Vector3(1,2,3) Yade [8]: a + c - [8]: Vector3(2,4,6) Jan -- You received this bug notification because you are a member of Yade developers, which is subscribed to Yade. https://bugs.launchpad.net/bugs/1031703 Title: extra value for bodies Status in Yet Another Dynamic Engine: New Bug description: Hi, It would be very helpful, if there would be an extra value for every body. This value can be set by the user. It must be a very fexible value (bool, int, float, vector, array, etc.). Example: I create a clump, which consists of two hardly overlapping spheres and sometimes I need the volume of the clump (which is not the sum of the volumes of the two spheres in this case). So this could be easily managed by this extra value. Where i could set either the volume of the clump as extra value to the clump or i could set the volume fractions as extra values to the spheres. To manage notifications about this bug go to: https://bugs.launchpad.net/yade/+bug/1031703/+subscriptions ___ Mailing list: https://launchpad.net/~yade-dev Post to : yade-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-dev More help : https://help.launchpad.net/ListHelp
[Yade-dev] [Bug 1031703] Re: extra value for bodies
3/ store the string representation of desired variable Yes that one too. I aprooved when I read it but didn't recall it. Not sure it would be easier than void pointer though, since it would need a lot of typecasting. Your example is ok in python but the vector3 can't be used in c++ at this point. Getting arbitrary types from a string in c++ is another story. I guess Christian has in mind to use e.g. clump volume in some c++ algorithm (right?), else there is little interest in adding variables to bodies. -- You received this bug notification because you are a member of Yade developers, which is subscribed to Yade. https://bugs.launchpad.net/bugs/1031703 Title: extra value for bodies Status in Yet Another Dynamic Engine: New Bug description: Hi, It would be very helpful, if there would be an extra value for every body. This value can be set by the user. It must be a very fexible value (bool, int, float, vector, array, etc.). Example: I create a clump, which consists of two hardly overlapping spheres and sometimes I need the volume of the clump (which is not the sum of the volumes of the two spheres in this case). So this could be easily managed by this extra value. Where i could set either the volume of the clump as extra value to the clump or i could set the volume fractions as extra values to the spheres. To manage notifications about this bug go to: https://bugs.launchpad.net/yade/+bug/1031703/+subscriptions ___ Mailing list: https://launchpad.net/~yade-dev Post to : yade-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-dev More help : https://help.launchpad.net/ListHelp
[Yade-dev] [Bug 1031703] Re: extra value for bodies
Another option is to keep the data outside bodies in a separate table. Saving a table is no big deal, and it doesn't waste memory when the table is empty. -- You received this bug notification because you are a member of Yade developers, which is subscribed to Yade. https://bugs.launchpad.net/bugs/1031703 Title: extra value for bodies Status in Yet Another Dynamic Engine: New Bug description: Hi, It would be very helpful, if there would be an extra value for every body. This value can be set by the user. It must be a very fexible value (bool, int, float, vector, array, etc.). Example: I create a clump, which consists of two hardly overlapping spheres and sometimes I need the volume of the clump (which is not the sum of the volumes of the two spheres in this case). So this could be easily managed by this extra value. Where i could set either the volume of the clump as extra value to the clump or i could set the volume fractions as extra values to the spheres. To manage notifications about this bug go to: https://bugs.launchpad.net/yade/+bug/1031703/+subscriptions ___ Mailing list: https://launchpad.net/~yade-dev Post to : yade-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-dev More help : https://help.launchpad.net/ListHelp
Re: [Yade-dev] [Bug 1031703] Re: extra value for bodies
2012/8/2 Chareyre 1031...@bugs.launchpad.net 3/ store the string representation of desired variable Yes that one too. I aprooved when I read it but didn't recall it. Not sure it would be easier than void pointer though, since it would need a lot of typecasting. Your example is ok in python but the vector3 can't be used in c++ at this point. Getting arbitrary types from a string in c++ is another story. I guess Christian has in mind to use e.g. clump volume in some c++ algorithm (right?), else there is little interest in adding variables to bodies. I was just thinking about using it in python, if it is supposed to be used in c++, then my solution definitely isn't the best one :-) Jan ___ Mailing list: https://launchpad.net/~yade-dev Post to : yade-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-dev More help : https://help.launchpad.net/ListHelp
