To transform the variables "solve" and to do the back-substitution "subs"...
2013/11/2 F. B. <franz.bona...@gmail.com> > > > On Saturday, November 2, 2013 11:46:27 AM UTC+1, Saullo Castro wrote: >> >> I believe we can make a variable transform and then apply the derivative >> using the expression converted to a variable, like: >> >> x = a**2 + c + d**3 >> x.diff((a + c**2)) >> >> changing variables: >> >> v = a + c**2 >> a = v - c**2 >> c = (v-a)**0.5 >> >> the new x will be: >> >> x2 = (v-c**2)**2 + (v-a)**0.5 + d**3 >> >> and the derivative could be computed as: >> >> x2.diff(v) >> >> is that reasonable? >> > > Yes, it is. > > Are you going to use .subs( ) or solve( ) ? > > -- > 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/P8Q3G5bHe-U/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > sympy+unsubscr...@googlegroups.com. > To post to this group, send email to sympy@googlegroups.com. > Visit this group at http://groups.google.com/group/sympy. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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 http://groups.google.com/group/sympy. For more options, visit https://groups.google.com/groups/opt_out.
