from sympy.printing.precedence, PRECEDENCE precedence(-x) == PRECEDENCE['Add'] It gives True.
On Wednesday, March 24, 2021 at 10:36:52 PM UTC+2 [email protected] wrote: > Can you clarify what you mean by this? > > The precedence of operators in Python is determined by the language. > See > https://docs.python.org/3/reference/expressions.html#operator-precedence. > Unary - has a higher precedence than binary + (or binary -). > > In SymPy, -x is represented as (-1)*x, but this is done after Python > parses the expression and converts them into SymPy objects. > > In Python, x - y is different from x + -y. In the former, - is a > binary operator and the latter it is a unary operator. They both use > the same symbol because it's unambiguous which is which. SymPy > represents these both as x + (-1)*y because this makes things simpler, > but this is only because it converts them both to that canonical form. > > Aaron Meurer > > On Wed, Mar 24, 2021 at 2:13 PM Paul Royik <[email protected]> wrote: > > > > Is there any reason why precedence of -x equals precedence of Add? > > -x is (-1)*x > > > > -- > > 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 view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/604cbda3-7b2f-4bb7-af4c-2f3b532edaa5n%40googlegroups.com > . > -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sympy/dc0c166a-3c9f-42f8-bc9a-b4acc504d4d3n%40googlegroups.com.
