Oh maybe it's just looking up the mpmath function named phi. We do have In [7]: import mpmath
In [8]: mpmath.phi Out[8]: <Golden ratio phi: 1.61803~> Aaron Meurer On Thu, Mar 10, 2016 at 2:01 PM, 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%3D6LN3PsQPiimfBjszH2LtJe7g_fShqy_FPdRfB7CxDGWAw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
