Correct. Thats the class structure as I see it.
On Thu, Mar 13, 2014 at 11:35 PM, Jason Moore <[email protected]> wrote: > Ok, that is clearer. So your reference frame has a notion of time whereas, > Prasoon's base classes only have notion of space. Correct? > > > Jason > moorepants.info > +01 530-601-9791 > > > On Thu, Mar 13, 2014 at 1:56 PM, Sachin Joglekar > <[email protected]>wrote: > >> I agree. Hence, the classes I plan to build on top of Prasoon's core will >> have time-dependent functionality to support motion. >> >> >> On Thu, Mar 13, 2014 at 11:23 PM, Tim Lahey <[email protected]> wrote: >> >>> I think it's necessary to have a reference frame that changes with >>> respect to time. Even something such as simple link can have a frame that >>> rotates with respect to the inertial frame. A rotating frame makes dealing >>> with the equations for a flexible link simpler. Plus, it's useful for >>> multi-body systems as well. >>> >>> Cheers, >>> >>> Tim. >>> >>> >>> On 13 Mar 2014, at 13:29, Sachin Joglekar wrote: >>> >>> Okay my words may have been a little confusing. To explain the terms >>>> better- >>>> *rotated* - oriented at a certain angle wrt the parent system >>>> *translated* - the origin of the translated system has a non-zero >>>> position >>>> >>>> vector wrt the parent system >>>> >>>> To put it more clearly, the orientation of the child system and the its >>>> origin's position vector are _not_ functions of time. Essentially, >>>> Prasoon's code does not deal with time at all. Its good to do simple >>>> vector >>>> calculus that does not involve time as a factor. >>>> By motion, I meant a system whose orientation/translation wrt its parent >>>> change with time. >>>> >>>> >>>> On Thu, Mar 13, 2014 at 10:50 PM, Jason Moore <[email protected]> >>>> wrote: >>>> >>>> "A coordinate system is a mathematical concept that helps one describe >>>>> points or vectors(directions) in space. A reference frame, on the other >>>>> hand, is the extension of this concept to involve motion >>>>> (time-dependent >>>>> quantities). Coordinate Systems may be rotated/translated with respect >>>>> to >>>>> each other, *but* they are stationary." >>>>> >>>>> >>>>> I don't understand this. How can a coordinate system be rotated and >>>>> translated yet be stationary. What is your definition of "motion"? >>>>> >>>>> >>>>> Jason >>>>> moorepants.info >>>>> +01 530-601-9791 >>>>> >>>>> >>>>> On Thu, Mar 13, 2014 at 12:31 PM, Sachin Joglekar < >>>>> [email protected] >>>>> >>>>>> wrote: >>>>>> >>>>> >>>>> Hello everyone. >>>>>> >>>>>> I have put up my proposal for the SymPy/PyDy project on creating a >>>>>> general-purpose vector calculus module for sympy. It will be a >>>>>> continuation >>>>>> of the work that was done by Prasoon and I last summer, and hopefully >>>>>> I >>>>>> plan to conclude it this time (much of it is currently unmerged). The >>>>>> details of the project are in my proposal at this link< >>>>>> https://github.com/pydy/pydy/wiki/GSoC-2014- >>>>>> Application:-srjoglekar246:-sympy.vector-module> >>>>>> >>>>>> . >>>>>> @Ondrej, Aaron, Stefan - please give your inputs for the same. >>>>>> >>>>>> -- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups >>>>>> "sympy" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an >>>>>> email to [email protected]. >>>>>> To post to this group, send email to [email protected]. >>>>>> Visit this group at http://groups.google.com/group/sympy. >>>>>> To view this discussion on the web visit >>>>>> https://groups.google.com/d/msgid/sympy/28a5bbe3-d6d7- >>>>>> 40a7-ae9e-6665524bf116%40googlegroups.com<https:// >>>>>> groups.google.com/d/msgid/sympy/28a5bbe3-d6d7-40a7-ae9e- >>>>>> 6665524bf116%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>> >>>>>> . >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>>> >>>>> -- >>>>> You received this message because you are subscribed to a topic in the >>>>> Google Groups "sympy" group. >>>>> To unsubscribe from this topic, visit >>>>> https://groups.google.com/d/topic/sympy/ux3MVAc9jeQ/unsubscribe. >>>>> To unsubscribe from this group and all its topics, send an email to >>>>> [email protected]. >>>>> To post to this group, send email to [email protected]. >>>>> Visit this group at http://groups.google.com/group/sympy. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/sympy/CAP7f1Aj2UhWxRyD3bumZ-DnhHNgJ% >>>>> 3DZ6OJQVhWa9%3Dn3SQVhbDOg%40mail.gmail.com<https:// >>>>> groups.google.com/d/msgid/sympy/CAP7f1Aj2UhWxRyD3bumZ- >>>>> DnhHNgJ%3DZ6OJQVhWa9%3Dn3SQVhbDOg%40mail.gmail.com? >>>>> utm_medium=email&utm_source=footer> >>>>> >>>>> . >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "sympy" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To post to this group, send email to [email protected]. >>>> Visit this group at http://groups.google.com/group/sympy. >>>> To view this discussion on the web visit https://groups.google.com/d/ >>>> msgid/sympy/CALMMyxZY5ev5-b1gVMGc%3DYroHtw3QHb34W0fFZ3kt7pEdShNY >>>> g%40mail.gmail.com. >>>> >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- >>> You received this message because you are subscribed to a topic in the >>> Google Groups "sympy" group. >>> To unsubscribe from this topic, visit https://groups.google.com/d/ >>> topic/sympy/ux3MVAc9jeQ/unsubscribe. >>> To unsubscribe from this group and all its topics, send an email to >>> [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at http://groups.google.com/group/sympy. >>> To view this discussion on the web visit https://groups.google.com/d/ >>> msgid/sympy/D52476D7-6B0D-4EFB-98C8-0A1AD20D9F8E%40gmail.com. >>> >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "sympy" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/sympy. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/sympy/CALMMyxb7GnofawspJYBOL2y8%2Byha3YKt9SCoVYKH3dkyi6cQ8Q%40mail.gmail.com<https://groups.google.com/d/msgid/sympy/CALMMyxb7GnofawspJYBOL2y8%2Byha3YKt9SCoVYKH3dkyi6cQ8Q%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to a topic in the > Google Groups "sympy" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/sympy/ux3MVAc9jeQ/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/CAP7f1AhSTD_JQJ%3DjFgpoKVU6s6toHay%2BwHPwo6Rku2zp0bBiQg%40mail.gmail.com<https://groups.google.com/d/msgid/sympy/CAP7f1AhSTD_JQJ%3DjFgpoKVU6s6toHay%2BwHPwo6Rku2zp0bBiQg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "sympy" group. 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