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%3DYroHtw3QHb34W0fFZ3kt7pEdShNYg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
