I'm cc'ing Paul Butler who wrote that method. Paul, are you following this thread?
On Sun, Dec 13, 2009 at 3:32 PM, Eugene Goldberg <omegat...@gmail.com> wrote: > So... There is no solution? > > On Dec 9, 6:03 pm, Sand Wraith <omegat...@gmail.com> wrote: >> Does anyone know is this issue only for newest version? (may be I >> should use older version of sage) >> >> On 8 дек, 21:47, David Joyner <wdjoy...@gmail.com> wrote: >> >> > Unfortunately, the piecewise class was written before the symbolic >> > expressions class and has not kept pace. >> >> > The obvious solution produced this: >> >> > sage: signal = Piecewise([[(0,1), cos(2*pi*1*x)], [(-1, 0), 0*x]]) >> > sage: signal.integral(definite=True) >> > --------------------------------------------------------------------------- >> > TypeError Traceback (most recent call last) >> >> > /Users/wdj/.sage/temp/jeeves.home/2806/_Users_wdj__sage_init_sage_0.py >> > in <module>() >> >> > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/functions/piecewise.pyc >> > in integral(self, x, a, b, definite) >> > 787 fun_integrated = fun.integral(x, end, x) >> > 788 else: >> > --> 789 fun_integrated = fun.integral(x, start, x) + area >> > 790 if definite or end != infinity: >> > 791 area += fun.integral(x, start, end) >> >> > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/symbolic/expression.so >> > in sage.symbolic.expression.Expression.integral >> > (sage/symbolic/expression.cpp:25344)() >> >> > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/calculus/calculus.pyc >> > in integral(expression, v, a, b, algorithm) >> > 635 else: >> > 636 try: >> > --> 637 result = expression._maxima_().integrate(v, a, b) >> > 638 except TypeError, error: >> > 639 s = str(error) >> >> > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/interfaces/maxima.pyc >> > in integral(self, var, min, max) >> > 2023 if max is None: >> > 2024 raise ValueError, "neither or both of min/max >> > must be specified." >> > -> 2025 return I(var, min, max) >> > 2026 >> > 2027 integrate = integral >> >> > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/interfaces/expect.pyc >> > in __call__(self, *args, **kwds) >> > 1402 >> > 1403 def __call__(self, *args, **kwds): >> > -> 1404 return self._obj.parent().function_call(self._name, >> > [self._obj] + list(args), kwds) >> > 1405 >> > 1406 def help(self): >> >> > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/interfaces/expect.pyc >> > in function_call(self, function, args, kwds) >> > 1310 [s.name() for s in args], >> > 1311 >> > ['%s=%s'%(key,value.name()) for key, value in kwds.items()]) >> > -> 1312 return self.new(s) >> > 1313 >> > 1314 def _function_call_string(self, function, args, kwds): >> >> > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/interfaces/expect.pyc >> > in new(self, code) >> > 1094 >> > 1095 def new(self, code): >> > -> 1096 return self(code) >> > 1097 >> > 1098 >> > ################################################################### >> >> > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/interfaces/expect.pyc >> > in __call__(self, x, name) >> > 1029 >> > 1030 if isinstance(x, basestring): >> > -> 1031 return cls(self, x, name=name) >> > 1032 try: >> > 1033 return self._coerce_from_special_method(x) >> >> > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/interfaces/expect.pyc >> > in __init__(self, parent, value, is_name, name) >> > 1445 except (TypeError, KeyboardInterrupt, >> > RuntimeError, ValueError), x: >> > 1446 self._session_number = -1 >> > -> 1447 raise TypeError, x >> > 1448 self._session_number = parent._session_number >> > 1449 >> >> > TypeError: Computation failed since Maxima requested additional >> > constraints (try the command 'assume(x>0)' before integral or limit >> > evaluation, for example): >> > Is x positive, negative, or zero? >> >> > On Tue, Dec 8, 2009 at 4:28 PM, Sand Wraith <omegat...@gmail.com> wrote: >> > > Hello, >> >> > > there is signal function: >> > > signal = Piecewise([ >> > > [(0,5), cos(2*pi*1*x) ], >> > > [(5,10), cos(2*pi*2.5*x) ], >> > > ]) >> >> > > And window function: >> > > window = Piecewise([[(-1,1),1]]) >> >> > > And the result function: >> > > r=window*signal >> >> > > How can I integrate it now? I'am trying: >> > > r.integral(definite=True) >> >> > > but it leads to error: "TypeError: integral() takes no arguments (3 >> > > given)" >> >> > > -- >> > > To post to this group, send email to sage-support@googlegroups.com >> > > To unsubscribe from this group, send email to >> > > sage-support+unsubscr...@googlegroups.com >> > > For more options, visit this group >> > > athttp://groups.google.com/group/sage-support >> > > URL:http://www.sagemath.org > > -- > To post to this group, send email to sage-support@googlegroups.com > To unsubscribe from this group, send email to > sage-support+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-support > URL: http://www.sagemath.org > -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
