I'd say this is a bug. Aaron Meurer
On Thu, Oct 10, 2013 at 2:58 PM, Duane Nykamp <[email protected]> wrote: > I'm using parse_expr to parse student input to online quizzes. Since I want > them to be able to type in an answer as "xe^x" for x*exp(x) I have tried to > do the following transformations. > > transformations=standard_transformations+(convert_xor, split_symbols, > implicit_multiplication) > > The result is: > > In [57]: parse_expr("xe^x", local_dict={'e': E}, > transformations=transformations) > Out[57]: e**x*x > > which means, the e was not mapped to E, as it should. If one makes the > multiplication explicit, and does not rely on split_symbols, then it works > correctly. > > In [58]: parse_expr("x*e^x", local_dict={'e': E}, > transformations=transformations) > Out[58]: x*exp(x) > > The function > def _split_symbols(tokens, local_dict, global_dict) > completely ignores local_dict and global_dict. Should somehow > _split_symbols call auto_symbol on the new tokens it created? > > Is there any way to get "xe^x" parsed as x*exp(x)? I suppose I could just > add a replace(Symbol('e'),E) after processing. > > Duane > > -- > 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. > 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. For more options, visit https://groups.google.com/groups/opt_out.
