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. 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