Your confusions here relate to Python's syntax. simplify is defined by the keyword argument to the rref() function:
def rref(self, iszerofunc=_iszero, simplify=False, pivots=True, normalize_last=True): The default is False, unless the user specifies simplify=<something else>, where <something else> should be a function. Actually this code is not written in a very idiomatic way. The default False implies that no simplification should happen, but this is not the case. A better way to write this code would be simpfunc = simplify or _simplify with the function definition as def rref(self, iszerofunc=_iszero, simplify=None, pivots=True, normalize_last=True): The isinstance(simplify, FunctionType) type check is not necessary. > why simplify is imported as _simplify as well as nsimplify? I mean what is > the need of both? The simplify() function is imported as _simplify because otherwise it would not be accessible in rref(), because the name "simplify" is already used by the keyword argument. nsimplify() is a separate function. The syntax from sympy.simplify import simplify as _simplify, nsimplify should be read as from sympy.simplify import (simplify as _simplify), nsimplify # This is not valid syntax, but this is how the precedence works or equivalently, from sympy.simplify import simplify as _simplify from sympy.simplify import nsimplify Aaron Meurer On Tue, Oct 30, 2018 at 1:34 PM Ruchit Vithani <[email protected]> wrote: > > I was looking code of rref() function of matrixes.py, In this function, there > is a function variable defined as > > simpfunc = simplify if isinstance( > simplify, FunctionType) else _simplify > > Why here it is checked that simplify is a FunctionType, which other type does > the simplify word has? > Also at the beginning of the matrices.py following is imported > > from sympy.simplify import simplify as _simplify, nsimplify > > why simplify is imported as _simplify as well as nsimplify? I mean what is > the need of both? > > > > -- > 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/8cf34aa0-bdaa-4fb3-a0b3-cdccfb731206%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%3D6%2BTXZvHgomvWuV58nzs6z0EyBTzfvz_B%3D5esgoLuNN%3DgQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
