Changes between Initial Version and Version 3 of Ticket #16643


Ignore:
Timestamp:
07/10/14 15:54:20 (7 years ago)
Author:
nbruin
Comment:

I changed the title and description, because I found evidence there is no infinite loop involved. Please change back if you're unhappy with the change.

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  • Ticket #16643

    • Property Summary changed from integrate() infinite loop to integrate() problem
  • Ticket #16643 – Description

    initial v3  
    55sage: integrate(f,x)
    66}}}
     7On a faster computer:
     8{{{
     9sage: %time integrate(f,x)
     10CPU times: user 3min 58s, sys: 50 ms, total: 3min 58s
     11Wall time: 3min 58s
     12integrate((tan(x)^2 + 1)*(x + tan(x))*e^tan(x) + (tan(x)^2 + 2)*e^tan(x), x)
     13}}}
     14On the other hand, for the equivalent expression
     15{{{
     16sage: g=e^tan(x)*sec(x)^2*(tan(x)+x)+e^tan(x)*(sec(x)^2+1)
     17sageRuntimeError: ECL says: In function CAR, the value of the first argument is
     18  0
     19which is not of the expected type LIST: %time integrate(g,x)
     20}}}
     21which happens in maxima/ECL with `abs_integrate` loaded, but not in maxima/SBCL.