Also type(phi) gives sympy.core.function.UndefinedFunction. This is confusing.
On 11 March 2016 at 00:31, Aaron Meurer <[email protected]> wrote: > Since this seems to break only when the function name is "phi", this > looks like an instance of https://github.com/sympy/sympy/issues/6938. > But I'm not quite sure what other SymPy function is named "phi". I > didn't find any in a quick grep. > > Aaron Meurer > > On Thu, Mar 10, 2016 at 1:54 PM, Sartaj Singh <[email protected]> > wrote: > > Apparently, this also does not work, > > > > # leosartaj at Mothership in ~/projects/sympy on git:master o [0:09:48] > > $ isympy > > IPython console for SymPy 1.0.1.dev (Python 2.7.11-64-bit) (ground types: > > python) > > > > These commands were executed: > >>>> from __future__ import division > >>>> from sympy import * > >>>> x, y, z, t = symbols('x y z t') > >>>> k, m, n = symbols('k m n', integer=True) > >>>> f, g, h = symbols('f g h', cls=Function) > >>>> init_printing() > > > > Documentation can be found at http://docs.sympy.org/dev > > > > In [1]: phi = symbols('phi', cls=Function) > > > > In [2]: phi(5.0) > > > --------------------------------------------------------------------------- > > TypeError Traceback (most recent call > last) > > <ipython-input-2-68868fcc8946> in <module>() > > ----> 1 phi(5.0) > > > > /home/leosartaj/projects/sympy/sympy/core/function.pyc in __new__(cls, > > *args, **options) > > 718 def __new__(cls, *args, **options): > > 719 args = list(map(sympify, args)) > > --> 720 obj = super(AppliedUndef, cls).__new__(cls, *args, > > **options) > > 721 return obj > > 722 > > > > /home/leosartaj/projects/sympy/sympy/core/cache.pyc in wrapper(*args, > > **kwargs) > > 93 retval = cfunc(*args, **kwargs) > > 94 except TypeError: > > ---> 95 retval = func(*args, **kwargs) > > 96 return retval > > 97 > > > > /home/leosartaj/projects/sympy/sympy/core/function.pyc in __new__(cls, > > *args, **options) > > 390 pr2 = min(cls._should_evalf(a) for a in result.args) > > 391 if pr2 > 0: > > --> 392 return result.evalf(mlib.libmpf.prec_to_dps(pr)) > > 393 return result > > 394 > > > > /home/leosartaj/projects/sympy/sympy/core/evalf.pyc in evalf(self, n, > subs, > > maxn, chop, strict, quad, verbose) > > 1384 options['quad'] = quad > > 1385 try: > > -> 1386 result = evalf(self, prec + 4, options) > > 1387 except NotImplementedError: > > 1388 # Fall back to the ordinary evalf > > > > /home/leosartaj/projects/sympy/sympy/core/evalf.pyc in evalf(x, prec, > > options) > > 1282 if 'subs' in options: > > 1283 x = x.subs(evalf_subs(prec, options['subs'])) > > -> 1284 xe = x._eval_evalf(prec) > > 1285 re, im = xe.as_real_imag() > > 1286 if re.has(re_) or im.has(im_): > > > > /home/leosartaj/projects/sympy/sympy/core/function.pyc in > _eval_evalf(self, > > prec) > > 501 > > 502 with mpmath.workprec(prec): > > --> 503 v = func(*args) > > 504 > > 505 return Expr._from_mpmath(v, prec) > > > > > /home/leosartaj/anaconda/envs/my/lib/python2.7/site-packages/mpmath/ctx_mp_python.pyc > > in __call__(self, prec, dps, rounding) > > 344 if not rounding: rounding = rounding2 > > 345 if dps: prec = dps_to_prec(dps) > > --> 346 return self.context.make_mpf(self.func(prec, rounding)) > > 347 > > 348 @property > > > > > /home/leosartaj/anaconda/envs/my/lib/python2.7/site-packages/mpmath/libmp/libelefun.pyc > > in f(prec, rnd) > > 114 def f(prec, rnd=round_fast): > > 115 wp = prec + 20 > > --> 116 v = fixed(wp) > > 117 if rnd in (round_up, round_ceiling): > > 118 v += 1 > > > > > /home/leosartaj/anaconda/envs/my/lib/python2.7/site-packages/mpmath/libmp/libelefun.pyc > > in g(prec, **kwargs) > > 95 memo_prec = f.memo_prec > > 96 if prec <= memo_prec: > > ---> 97 return f.memo_val >> (memo_prec-prec) > > 98 newprec = int(prec*1.05+10) > > 99 f.memo_val = f(newprec, **kwargs) > > > > TypeError: unsupported operand type(s) for >>: 'long' and 'mpf' > > > > > > This does work though, > > > >>>> phi(5) > > φ(5) > > > > However, > > > >>>> p = symbols('p', cls=Function) > >>>> p(5.0) > > p(5.0) > > > >>>> p(t).xreplace({t: 5.0}) > > p(5.0) # works without any problems > > > > > > By My understanding, is symbols with cls=Function arg not expected to > make > > an undefined function? > > > > > > On Friday, 11 March 2016 00:03:38 UTC+5:30, Jason Moore wrote: > >> > >> I don't understand this behavior: > >> > >> Python 3.5.1 |Continuum Analytics, Inc.| (default, Dec 7 2015, > 11:16:01) > >> Type "copyright", "credits" or "license" for more information. > >> > >> IPython 4.1.2 -- 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]: from sympy import * > >> > >> In [2]: phi = symbols('phi', cls=Function) > >> > >> In [3]: t = symbols('t') > >> > >> In [4]: phi(t).xreplace({t: 0}) > >> Out[4]: phi(0) > >> > >> In [5]: phi(t).xreplace({t: 0.0}) > >> Out[5]: 1.61803398874989 > >> > >> In [6]: phi(t).xreplace({t: 5.0}) > >> > >> > --------------------------------------------------------------------------- > >> KeyError Traceback (most recent call > >> last) > >> > >> > /home/moorepants/miniconda3/lib/python3.5/site-packages/sympy/core/evalf.py > >> in evalf(x, prec, options) > >> 1209 try: > >> -> 1210 rf = evalf_table[x.func] > >> 1211 r = rf(x, prec, options) > >> > >> KeyError: phi > >> > >> During handling of the above exception, another exception occurred: > >> > >> TypeError Traceback (most recent call > >> last) > >> <ipython-input-6-ec5c48b4cb2f> in <module>() > >> ----> 1 phi(t).xreplace({t: 5.0}) > >> > >> > >> > /home/moorepants/miniconda3/lib/python3.5/site-packages/sympy/core/basic.py > >> in xreplace(self, rule) > >> 1086 args = tuple(args) > >> 1087 if not _aresame(args, self.args): > >> -> 1088 return self.func(*args) > >> 1089 return self > >> 1090 > >> > >> > >> > /home/moorepants/miniconda3/lib/python3.5/site-packages/sympy/core/function.py > >> in __new__(cls, *args, **options) > >> 683 def __new__(cls, *args, **options): > >> 684 args = list(map(sympify, args)) > >> --> 685 obj = super(AppliedUndef, cls).__new__(cls, *args, > >> **options) > >> 686 return obj > >> 687 > >> > >> > >> > /home/moorepants/miniconda3/lib/python3.5/site-packages/sympy/core/function.py > >> in __new__(cls, *args, **options) > >> 380 pr2 = min(cls._should_evalf(a) for a in result.args) > >> 381 if pr2 > 0: > >> --> 382 return result.evalf(mlib.libmpf.prec_to_dps(pr)) > >> 383 return result > >> 384 > >> > >> > >> > /home/moorepants/miniconda3/lib/python3.5/site-packages/sympy/core/evalf.py > >> in evalf(self, n, subs, maxn, chop, strict, quad, verbose) > >> 1315 options['quad'] = quad > >> 1316 try: > >> -> 1317 result = evalf(self, prec + 4, options) > >> 1318 except NotImplementedError: > >> 1319 # Fall back to the ordinary evalf > >> > >> > >> > /home/moorepants/miniconda3/lib/python3.5/site-packages/sympy/core/evalf.py > >> in evalf(x, prec, options) > >> 1215 if 'subs' in options: > >> 1216 x = x.subs(evalf_subs(prec, options['subs'])) > >> -> 1217 re, im = x._eval_evalf(prec).as_real_imag() > >> 1218 if re.has(re_) or im.has(im_): > >> 1219 raise NotImplementedError > >> > >> > >> > /home/moorepants/miniconda3/lib/python3.5/site-packages/sympy/core/function.py > >> in _eval_evalf(self, prec) > >> 484 > >> 485 with mpmath.workprec(prec): > >> --> 486 v = func(*args) > >> 487 > >> 488 return Expr._from_mpmath(v, prec) > >> > >> > >> > /home/moorepants/miniconda3/lib/python3.5/site-packages/sympy/mpmath/ctx_mp_python.py > >> in __call__(self, prec, dps, rounding) > >> 344 if not rounding: rounding = rounding2 > >> 345 if dps: prec = dps_to_prec(dps) > >> --> 346 return self.context.make_mpf(self.func(prec, rounding)) > >> 347 > >> 348 @property > >> > >> > >> > /home/moorepants/miniconda3/lib/python3.5/site-packages/sympy/mpmath/libmp/libelefun.py > >> in f(prec, rnd) > >> 114 def f(prec, rnd=round_fast): > >> 115 wp = prec + 20 > >> --> 116 v = fixed(wp) > >> 117 if rnd in (round_up, round_ceiling): > >> 118 v += 1 > >> > >> > >> > /home/moorepants/miniconda3/lib/python3.5/site-packages/sympy/mpmath/libmp/libelefun.py > >> in g(prec, **kwargs) > >> 95 memo_prec = f.memo_prec > >> 96 if prec <= memo_prec: > >> ---> 97 return f.memo_val >> (memo_prec-prec) > >> 98 newprec = int(prec*1.05+10) > >> 99 f.memo_val = f(newprec, **kwargs) > >> > >> TypeError: unsupported operand type(s) for >>: 'int' and 'mpf' > >> > >> Can someone explain to me what is going on? I would expect "t" to be > >> simply replaced with the number. > >> > >> Jason > >> moorepants.info > >> +01 530-601-9791 > > > > -- > > 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/b40c4bb2-e74a-4399-8a40-879e380ea65e%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%3D6J93TOhZxUL2D-qq55v%3D6_GgfWK6e38rx66gtq%2BHazTQw%40mail.gmail.com > . > For more options, visit https://groups.google.com/d/optout. > -- Regards *Sartaj Singh* *Mathematics and Computing*, Indian Institute of Technology, Varanasi - 221 005 INDIA E-mail: [email protected], *[email protected] <[email protected]>* -- You received this message because you are subscribed to the Google Groups "sympy" group. 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