Nuno, Simplification of very large expressions is typically not a good idea due to the time needed for computation. Unless you have a specific need to simplify the resulting equations, I'd avoid it.
Jason moorepants.info +01 530-601-9791 On Tue, Aug 2, 2016 at 5:25 PM, Nuno <nmi...@gmail.com> wrote: > I have created a jupyter notebook where I'm defining a multibody system in > order to obtain its kinematics and dynamics. > > I use the KanesMethod (from sympy) in order to obtain the equations of > motion of the system. > > > However when I try to use trigsimp() on the mass matrix obtained, it seems > to get stuck there forever (displaying an 'In[*]' next to that line). > > > The line is: 'mass_matrix = trigsimp(kane.mass_matrix)' > > Here's a screenshot:https://gyazo.com/8c6ac6cefd87b889a4ed8f9a9c3077d9 > > (The python process is using ~30% of the processor) > > > The matrix is a 6x6 matrix, but some of the elements have lot's of > trignometric functions since there are 3 reference frames with 3D rotations > in order to each other. > > > So what's happening? I have no experience with sympy, so I'm a little lost. > > (I'm sorry if this is a duplicate, but I couldn't find my first publish > and I wanted to add more info) > > -- > 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 sympy+unsubscr...@googlegroups.com. > To post to this group, send email to sympy@googlegroups.com. > Visit this group at https://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/0f1d7a62-4f2e-473d-8a44-fe6aaf403f22%40googlegroups.com > <https://groups.google.com/d/msgid/sympy/0f1d7a62-4f2e-473d-8a44-fe6aaf403f22%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 the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAP7f1AhoXycsz9wdkjh0SRQQ1LeEMX%3DS1pRbj8OcY1bO4o-22Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
