Yes, this is a bug (can you open an issue for it?). It looks like the expression is correct, but the printer isn't putting parentheses around the (-B + A).
Aaron Meurer On Fri, Nov 4, 2016 at 2:37 PM, Nathan Thern <[email protected]> wrote: > Does this session illustrate a bug, or am I missing a concept here? > > Jupyter console 5.0.0 > Python 3.5.2 (v3.5.2:4def2a2901a5, Jun 25 2016, 22:01:18) [MSC v.1900 32 bit > (Intel)] > Type "copyright", "credits" or "license" for more information. > IPython 5.1.0 -- An enhanced Interactive Python. > ? -> Introduction and overview of IPython's features. > %quickref -> Quick reference. > help -> Python's own help system. > object? -> Details about 'object', use 'object??' for extra details. > > In [1]: import sympy > In [2]: sympy.__version__ > Out[2]: '1.0' > In [3]: from sympy import * > In [4]: A=MatrixSymbol('A',1,3) > In [5]: B=MatrixSymbol('B',1,3) > In [6]: C=MatrixSymbol('C',1,3) > In [7]: E=A-B > In [8]: F=C[0,0] > In [9]: F.subs(C,E) > Out[9]: (-1)*B + A[0, 0] > In [10]: > > > I would think the output of the last command should be > (-1)*B[0,0] + A[0, 0] > > > -- > 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 https://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/f37123a0-328c-4268-b44e-59534e3d61ef%40googlegroups.com. > 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 https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6KLDh-1TECbKstPojGirgJ3-dZ_0fpZtAztqe7wn1VwOA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
