Hi guys, back again. It seems that I can never find what I look for in the reference documents, but it always becomes embarrassingly easy once someone explains it to me.
I've been playing around with the displacement reaction for viscous drag ballistics, and have derived the following equation: final = s == t*v_t + ((v_0 - v_t)/k)*(1 - e^(-k*t)) + s_0 Now one treatment suggests replacing s, s_0, v_t and v_0 with 3 dimensional vectors, so that you can calculate all dimensions in one go, but when I attempt to do the following: final.subs(s_0 == vector([0,0,0])) I get: TypeError: subs takes either a set of keyword arguments, a dictionary, or a symbolic relational expression I'm assuming that I need to define the original equation in a vector space, but have no idea how to do this. Any suggestions? Joal Heagney -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
