#1751 log(x) with assume(x<0) and similar problems

closed
nobody
5
2009-10-31
2009-09-03
No

The problem I think boils down to the fact, that integrates 1/x as log(x), even if x < 0. The attached file gives more instructions suffering from this problem.

Discussion

  • Raymond Toy

    Raymond Toy - 2009-09-03

    Can you please describe the problem here for those who do not use wxmaxima?

     
  • Harry Litzroth

    Harry Litzroth - 2009-09-03

    Integrating 1/x gives log x, instead of log |x|. If assume(x<0) Maxima nevertheless has no problem with plotting log(x) between [x^, 10^6, 10], and simply calls the assume inconistent. I will post ab html-file with more details.

     
  • Raymond Toy

    Raymond Toy - 2009-09-04
    • labels: 460521 --> Lisp Core - Integration
     
  • Dieter Kaiser

    Dieter Kaiser - 2009-10-31

    Closing this bug report because it is the expected behavior of Maxima. See comment in the last posting.

    Dieter Kaiser

     
  • Dieter Kaiser

    Dieter Kaiser - 2009-10-31
    • status: open --> closed
     

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