Is the other result incorrect, or just more complicated? Aaron Meurer
On Tue, May 6, 2014 at 12:20 PM, David Schueler <[email protected]> wrote: > It seems that sympy cannot properly break apart functions for integration. > > Python 2.7.6 |Anaconda 1.9.1 (x86_64)| (default, Jan 10 2014, 11:23:15) > Type "copyright", "credits" or "license" for more information. > > IPython 2.0.0 -- 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. > %guiref -> A brief reference about the graphical user interface. > > In [1]: from sympy import * > > In [2]: init_session() > IPython console for SymPy 0.7.5 (Python 2.7.6-64-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) > > Documentation can be found at http://www.sympy.org > WARNING: Hook shutdown_hook is deprecated. Use the atexit module instead. > > > > In [5]: print integrate(expand((x-2)/sqrt(x)),(x,1,4)) > 2/3 > > In [6]: print integrate((x-2)/sqrt(x),(x,1,4)) > -6 > > The former is correct based on other calculations. > > Also: > > print integrate(expand((x-2)/sqrt(x)),x) > 2*x**(3/2)/3 - 4*sqrt(x) > > print integrate((x-2)/sqrt(x),x) > 2*sqrt(1 + 2/(x - 2))*(x - 2)**(7/2)/(6*x + 3*(x - 2)**2 - 12) - 4*sqrt(1 + > 2/(x - 2))*(x - 2)**(5/2)/(6*x + 3*(x - 2)**2 - 12) - 16*sqrt(1 + 2/(x - > 2))*(x - 2)**(3/2)/(6*x + 3*(x - 2)**2 - 12) + 8*sqrt(2)*(x - 2)**2/(6*x + > 3*(x - 2)**2 - 12) + 16*sqrt(2)*(x - 2)/(6*x + 3*(x - 2)**2 - 12) > > Again, the former is correct. > > Thoughts? > > -- > 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 http://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/63e4d240-59d5-422f-b265-0b2b1895142f%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 http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6LAqdTZVa0Nn6uOR90SEnNrA_LxfOvccAjCf2p_tF1sRg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
